• AR-15 GEN 2 STRIPPED LOWER RECEIVER, BLACK AERO PRECISION More Detail

    AR-15 GEN 2 STRIPPED LOWER RECEIVER, BLACK AERO PRECISION

    Click here for price!$89.99Click here for price!$89.99

    Stripped, small pin, semi-auto lower receiver is precision machined from a durable, 7075 T6 aluminum forging. Stamped “Cal Multi,” this versatile mil-spec receiver can be the foundation for rifle builds on 5.56/.223, 6.5mm, 6.8mm, 300 AAC Blackout, 9mm Luger, or other chamberings that fit the standard AR-15 receiver. Holes, inletting and pin locations have been cut to final dimensions and accept standard AR-15 magazines and components. Clearly stamped safe/fire switch position indicators ensure that you can easily identify the service state of the rifle. Big Book Catalog, Issue:69, Page:007

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  • AR-15 M16 A1 UPPER RECEIVER BROWNELLS More Detail

    AR-15 M16 A1 UPPER RECEIVER BROWNELLS

    Click here for price!$150.00Click here for price!$150.00

    Designed in conjunction with Nodak Spud, the Brownells M16A1 Upper Receiver matches the features of the original M16A1 Receiver. Perfect for a “Retro” or reproduction build, these uppers precisely mirror the original profile. This match is only possible by utilizing forgings with the proper profile built-in. Features specific to the Brownells M16A1 Upper Receiver are the original A1 profile, with no shell deflector, A1 rear sight housing and proper carry handle contours. The upper starts off as a 7075 T6 aluminum forging, then is machined to mil-spec dimensions. Once machined, the upper is finished with a matte black hard anodized finish. This finish matches most modern lowers found on the market today, as well as the Brownells BRN-16A1 Lower Receiver sold separately. Upper receiver does NOT have M4 feedramps. Standard AR-15 components will work perfectly with this upper. This upper is the proper receiver for the following reproduction builds: XM16E1 M16A1 Model 607 Model 609 (XM177E1) Model 619 Model 629 (XM177E2) Model 639 Model 651 Model 653 Upper is not compatible with Anderson Mfg Lower Receivers due to rear takedown lug depth.

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  • AR-15 STRIPPED LOWER RECEIVER ANDERSON MANUFACTURING More Detail

    AR-15 STRIPPED LOWER RECEIVER ANDERSON MANUFACTURING

    Click here for price!$49.99Click here for price!$49.99

    Stripped, semi-auto, lower receiver delivers custom shop quality without the typical custom shop price. Perfect platform for building the ultimate, mission-specific, AR-15 rifle or carbine. Made from a high-strength, 7075 T6 aluminum forging for reliable performance and outstanding durability. Mil-Spec, hard anodized finish adds extra strength to the receiver walls and delivers superior abrasion-resistance for rugged field use. Precision-machined to ensure drop-in installation of Mil-Spec, aftermarket components. AR-15, Issue:11, Page:007 Big Book Catalog, Issue:69, Page:007

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  • AR-15 80% LOWER RECEIVER BLACK ANODIZED ANDERSON MANUFACTURING More Detail

    AR-15 80% LOWER RECEIVER BLACK ANODIZED ANDERSON MANUFACTURING

    Click here for price!$56.99Click here for price!$56.99

    Anderson Manufacturing 80% Lower Receiver is forged from 7075-T6 aluminum, for a superior custom build.  80% receiver black anodized, and requires completion by the user.  Operations left to be completed include fire control/trigger group milling, trigger pin, hammer pin, trigger slot, and the safety selector hole. This is not an FFL item and requires machining to complete.   Returns will not be accepted once the receiver is modified in any way.

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  • AR-15 COMPLETE UPPER RECEIVER BLACK KEYMOD 5.56 BROWNELLS More Detail

    AR-15 COMPLETE UPPER RECEIVER BLACK KEYMOD 5.56 BROWNELLS

    Click here for price!$369.99Click here for price!$369.99

    This Brownells’ exclusive Complete AR Upper Receiver is chambered in 5.56x45mm NATO and made in the USA. Includes a low profile gas block, bolt carrier group, charging handle, forward assist, ejection port cover and phosphate finish help to complete this outstanding package. The 16” standard M4 carbine length barrel features a standard M4 contour with a 1:8 twist. A standard A3 13-slot aluminum flat top receiver comes with a 10” free-float handguard utilizing the KeyMod rail system. 7075 aluminum Mil-Spec upper receiver M4 feed ramps 416R steel barrel with black nitride finish inside and out Standard A2 birdcage style threaded flash hider Weight: 4.85lbs This complete A3 upper receiver will attach to almost any standard AR-15 lower receiver.   The BCG is the M16-style BCG. It will not work with older Colt lowers that have the sear block.

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  • AR-15 RECEIVER SET W/LOWER PARTS KIT & STOCK BROWNELLS More Detail

    AR-15 RECEIVER SET W/LOWER PARTS KIT & STOCK BROWNELLS

    Click here for price!$547.99Click here for price!$547.99

    New from Brownells, a receiver set that features the Brownell's complete AR-15 upper receiver, an anodized 80% lower receiver, a mil-spec collapsible buttstock assembly, and a lower parts kit to finish out the project. This Brownells’ exclusive Complete AR Upper Receiver is Made in the USA.  Chambered in 5.56x45mm NATO and featuring a 16” barrel with a 1:8 twist.  The standard A3 13-slot aluminum flat top receiver comes with a 10” handguard utilizing the KeyMod rail system.  A low profile gas block, bolt carrier group,  charging handle, forward assist, ejection port cover and phosphate finish help to complete this outstanding package.  This complete A3 upper receiver will attach to almost any standard AR-15 lower receiver. Anderson Manufacturing 80% Lower Receiver is forged from 7075-T6 aluminum, for a superior custom build.  80% receiver black anodized, and requires completion by the user.  Operations left to be completed include fire control/trigger group milling, trigger pin, hammer pin, trigger slot, and the safety selector hole. This is not an FFL item and requires machining to complete. Collapsible buttstock similar to the current US GI M4 carbine stock provides convenient six-position length-of-pull adjustment to fit different-size shooters, including those wearing body armor. Ready to install on any standard AR-15 rifle or carbine lower receiver; includes buffer tube, receiver lock plate, lock nut, toe-mounted steel sling loop, carbine recoil spring and buffer. Buttstock is made from extremely tough, fiberglass-reinforced, injection-molded nylon to resist impact, heat, moisture, extreme cold, and most cleaning solvents. Steel lock nut has four square notches and pre-cut detents for staking to lock plate. Available with Mil-Spec (nominal 1.14" O.D.) receiver extension tube. Stock interior diameter is matched to buffer tube O.D. for a snug fit that eliminates un wanted play and rattles. Lastly, the easiest way to stock and sell genuine, mil-spec AR-15 parts, or use to assemble rifles on your receivers. Much lower in total cost than buying the parts one at a time. Kit contains only new, current-production, genuine, mil-spec parts; never pull-offs or direct-exchange surplus. Lower Receiver Parts Kit includes trigger spring, trigger pin, hammer spring, hammer pin, disconnector and spring, bolt catch, bolt catch plunger, bolt catch spring, bolt catch roll pin, selector, selector detent, selector detent spring, (2) takedown detents and springs, pivot pin, rear takedown pin, buffer retainer and spring, magazine catch, button and spring, screw and washer, triggerguard assembly, pin, hammer, trigger and pistol grip. Returns will not be accepted once the receiver is modified in any way.  

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  • AR-15/M16 STRIPPED UPPER RECEIVER AERO PRECISION More Detail

    AR-15/M16 STRIPPED UPPER RECEIVER AERO PRECISION

    Click here for price!$84.99 - $109.99Click here for price!$84.99 - $109.99

    Economical Yet High-Quality Upper For Your Custom Build The Aero Precision upper is made of 7075 aircraft aluminum for superior strength and given a super tough, Type 3 hardcoat anodized finish for excellent wear resistance. Models with laser-engraved T-marks and an American flag on the Picatinny rail, plus M4-type feed cuts inside for reliable feeding also available. Compatible with standard, mil-spec AR lowers and components. A really high-quality receiver at a great price! AR-15, Issue:11, Page:001 Big Book Catalog, Issue:69, Page:001

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  • AR-15 STRIPPED UPPER RECEIVER BLACK BROWNELLS More Detail

    AR-15 STRIPPED UPPER RECEIVER BLACK BROWNELLS

    Click here for price!$69.99Click here for price!$69.99

    Standard Mil-Spec flat top upper receiver. Features M4 feedramps. Machined from 7075-T6 forgings. Hard coat anodized with a teflon coating in a matte black finish.

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  • FORGED A4 UPPER RECEIVER ASSEMBLY ROCK RIVER ARMS More Detail

    FORGED A4 UPPER RECEIVER ASSEMBLY ROCK RIVER ARMS

    Click here for price!$125.00Click here for price!$125.00

    Forged aluminum A4 style upper receivers with ejection port cover and forward assist installed. Features M4 feed ramps.

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  • AR-15 ASSEMBLED UPPER RECEIVER KEYMOD 300 BLACKOUT BROWNELLS More Detail

    AR-15 ASSEMBLED UPPER RECEIVER KEYMOD 300 BLACKOUT BROWNELLS

    Click here for price!$284.99Click here for price!$284.99

    This Brownells’ exclusive AR-15 Upper Receiver is Made in the USA.  Chambered in 300 Blackout and featuring a 16” barrel with a 1:8 twist.  The standard A3 13-slot aluminum flat top receiver comes with a 10” handguard utilizing the KeyMod rail system.  A low profile gas block, forward assist, ejection port cover and phosphate finish help to complete this package. Left out of this upper are the bolt carrier group as well as the charging handle so you can customize the upper any way you want! The A3 upper receiver will attach to almost any standard AR-15 lower receiver.

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  • AR-15 80% LOWER RECEIVER ANDERSON MANUFACTURING More Detail

    AR-15 80% LOWER RECEIVER ANDERSON MANUFACTURING

    Click here for price!$49.99Click here for price!$49.99

    Anderson Manufacturing 80% Lower Receiver is forged from 7075-T6 aluminum, for a superior custom build.  80% receiver ships in the white, and requires completion by the user.   Operations left to be completed include fire control/trigger group milling, trigger pin, hammer pin, trigger slot, and the safety selector hole. This is not an FFL item and requires machining to complete. Returns will not be accepted once the receiver is modified in any way. Big Book Catalog, Issue:69, Page:007

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  • UPPER RECEIVER ORACLE BARREL ASSEMBLY DPMS More Detail

    UPPER RECEIVER ORACLE BARREL ASSEMBLY DPMS

    Click here for price!$479.00Click here for price!$479.00

    The DPMS Oracle AR-15 Upper Receiver Assembly comes completely assembled and ready for installation on any standard small pin, mil-spec lower receiver. The Oracle is an excellent entry-level upper assembly that incorporates the versatility of the A3 Flat-Top configuration in selecting a preferred sighting arrangement with a solid, fully functional foundation of quality components. Add to that an attractive price and the Oracle becomes the ideal candidate for shooter customization and/or for assembling a lightweight, fast handling, general purpose carbine that won't break the bank. The Oracle features a 16" Light Contour "Pencil" Barrel for reduced weight, a true 5.56x45mm NATO chamber for use with either commercial or mil-spec ammunition, and employs the versatile 1 in 9" rifling twist rate capable of stabilizing a wide selection of different bullet weights. The upper comes equipped with heat resistant GlacierGuard polymer handguards, single rail gas block, ejection port door, forward assist, shell deflector, charging handle, complete bolt & carrier assembly, and an A2 flash hider. Aluminum parts are hard coat anodized to mil-spec, steel parts are manganese phosphate treated (parkerized) matte black. Technical Information Upper Receiver: A3 Flat-Top Barrel Length: 16" Barrel Contour: Lightweight Barrel Material: 4140 Chrome Moly Steel Muzzle Thread Pattern: 1/2"-28 Chrome Lined: No Barrel Finish: Parkerized Twist Rate: 1 in 9" Chamber: 5.56x45mm NATO M4 Feed Ramps: Yes Muzzle Device: A2 Flash Hider Gas System Length: Carbine Gas Block Diameter: 0.750" Handguard: DPMS GlacierGuard 2-Piece Polymer Sights: None Bolt Carrier Assembly Included: Yes Bolt Carrier Type: M16 Bolt Carrier Extras: Single Rail Gas Block Oracle comes with ejection port door, forward assist & shell deflector AR-15, Issue:11, Page:003 Big Book Catalog, Issue:69, Page:005

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  • AR-15/M16 ASSEMBLED UPPER RECEIVER AERO PRECISION More Detail

    AR-15/M16 ASSEMBLED UPPER RECEIVER AERO PRECISION

    Click here for price!$99.99 - $114.99Click here for price!$99.99 - $114.99

    The AR-15 Assembled Upper Receiver comes with the port door and forward assist already installed. Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil- spec M16/M4 specifications and features M4 feedramps. Black model features laser engraved T marks. Cerakote FDE model does not have T marks. Features: M4 Feedramps .250 takedown pin holes Includes port door and forward assist Big Book Catalog, Issue:69, Page:001

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  • AR-15 UPPER RECEIVER W/ LOWER PARTS KIT & STOCK ASSEMBLY BROWNELLS More Detail

    AR-15 UPPER RECEIVER W/ LOWER PARTS KIT & STOCK ASSEMBLY BROWNELLS

    Click here for price!$492.99Click here for price!$492.99

    This kit lets you pick out a lower of your choice along with a couple small parts to help complete your build! This kit boasts the Brownell's exclusive complete upper receiver, the Brownell's M4 stock assembly, and DPMS Lower Parts Kit. This Brownells’ exclusive Complete AR Upper Receiver is Made in the USA.  Chambered in 5.56x45mm NATO and featuring a 16” barrel with a 1:8 twist.  The standard A3 13-slot aluminum flat top receiver comes with a 10” handguard utilizing the KeyMod rail system.  A low profile gas block, bolt carrier group,  charging handle, forward assist, ejection port cover and phosphate finish help to complete this outstanding package.  This complete A3 upper receiver will attach to almost any standard AR-15 lower receiver. Collapsible buttstock similar to the current US GI M4 carbine stock provides convenient six-position length-of-pull adjustment to fit different-size shooters, including those wearing body armor. Ready to install on any standard AR-15 rifle or carbine lower receiver; includes buffer tube, receiver lock plate, lock nut, toe-mounted steel sling loop, carbine recoil spring and buffer. Buttstock is made from extremely tough, fiberglass-reinforced, injection-molded nylon to resist impact, heat, moisture, extreme cold, and most cleaning solvents. Steel lock nut has four square notches and pre-cut detents for staking to lock plate. Available with Mil-Spec (nominal 1.14" O.D.) receiver extension tube. Stock interior diameter is matched to buffer tube O.D. for a snug fit that eliminates unwanted play and rattles.   The easiest way to stock and sell genuine, mil-spec AR-15 parts, or use to assemble rifles on your receivers. Much lower in total cost than buying the parts one at a time. Kit contains only new, current-production, genuine, mil-spec parts; never pull-offs or direct-exchange surplus. Lower Receiver Parts Kit includes trigger spring, trigger pin, hammer spring, hammer pin, disconnector and spring, bolt catch, bolt catch plunger, bolt catch spring, bolt catch roll pin, selector, selector detent, selector detent spring, (2) takedown detents and springs, pivot pin, rear takedown pin, buffer retainer and spring, magazine catch, button and spring, screw and washer, triggerguard assembly, pin, hammer, trigger and pistol grip.  

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  • AR-15 COMPLETE UPPER RECEIVER BLACK KEYMOD 300 BLK BROWNELLS More Detail

    AR-15 COMPLETE UPPER RECEIVER BLACK KEYMOD 300 BLK BROWNELLS

    Click here for price!$369.99Click here for price!$369.99

    This Brownells’ exclusive Complete AR Upper Receiver is Made in the USA.  Chambered in 300 Blackout and featuring a 16” barrel with a 1:8 twist.  The standard A3 13-slot aluminum flat top receiver comes with a 10” handguard utilizing the KeyMod rail system.  A low profile gas block, bolt carrier group,  charging handle, forward assist, ejection port cover and phosphate finish help to complete this outstanding package.  This complete A3 upper receiver will attach to almost any standard AR-15 lower receiver.

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  • AR-15 STRIPPED BILLET LOWER RECEIVER NOREEN FIREARMS, LLC More Detail

    AR-15 STRIPPED BILLET LOWER RECEIVER NOREEN FIREARMS, LLC

    Click here for price!$58.99Click here for price!$58.99

    Noreen Billet aluminum AR-15 Lower Receivers are ready for your next build. 6061 Aluminum Type III Class II hard coat anodizing Broached magazine well ensures a smooth mag insertion Compatible with all AR15 parts Enlarged integral trigger guard Starting with billet allow for extremely tight tolerances Matte black finish Made in the USA

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  • MCR BELT-FED UPPER RECEIVER FULL AUTO FIGHTLITE INDUSTRIES More Detail

    MCR BELT-FED UPPER RECEIVER FULL AUTO FIGHTLITE INDUSTRIES

    Click here for price!$4,195.00Click here for price!$4,195.00

    The FightLite Industries MCR Belt Fed AR-15/M16 Upper Receiver allows you to convert your AR-15 or M16 from a standard, magazine fed rifle, into a multi-purpose belt-fed, that can also feed from a magazine. Simply attach the upper as you would any other, link up your ammunition and go to the range. This unique upper receiver includes a Picatinny rail mounted to the top cover, as well as a Picatinny handguard. 16.25” quick change barrel features a chrome lined bore & chamber. 1-7 twist stabilizes standard, military ammunition, ½-28 muzzle accepts standard muzzle devices and 100 links. Receiver is machined from 7075-T6 billet & features a Type III matte black anodized finish. 6-lug rotating bolt is more robust than a standard AR-15 bolt, and is designed for sustained fire roles. Bolt carrier is full-auto. Upper utilizes M249 SAW links. Upper weighs 7.45 lbs & has an OAL of 32.25”.

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  • AR-15 LOWER RECEIVER COMPLETE WITH M4 STOCK ASSEMBLY DPMS More Detail

    AR-15 LOWER RECEIVER COMPLETE WITH M4 STOCK ASSEMBLY DPMS

    Click here for price!$199.99Click here for price!$199.99

    Forged, fully assembled lower is ready for your choice of upper. Precision machined from 7075-T6 aircraft-grade aluminum alloy, mil-spec hardcoat anodized, then Teflon-coated black for superior wear and scratch resistance.  Includes mil-spec trigger group. The M4 lower is equipped with a 6-position, collapsible carbine stock made of impact-resistant polymer.

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  • AR-15 COMPLETE UPPER KEYMOD 5.56 W/ 5-PK 30-RD PMAG BROWNELLS More Detail

    AR-15 COMPLETE UPPER KEYMOD 5.56 W/ 5-PK 30-RD PMAG BROWNELLS

    Click here for price!$431.49Click here for price!$431.49

    This Brownells’ exclusive Complete AR Upper Receiver is Made in the USA.  Chambered in 5.56x45mm NATO and featuring a 16” barrel with a 1:8 twist.  The standard A3 13-slot aluminum flat top receiver comes with a 10” handguard utilizing the KeyMod rail system.  A low profile gas block, bolt carrier group,  charging handle, forward assist, ejection port cover and phosphate finish help to complete this outstanding package.  This complete A3 upper receiver will attach to almost any standard AR-15 lower receiver. The receiver is being paired with 5 Magpul PMAGs for even better savings! Exceptionally rugged, combat- and competition-ready magazine functions flawlessly, even when left fully loaded for extended periods. Corrosion-proof, self-lubricating one-piece body of fiber-reinforced, molded polymer has no spot welds or joints to impair the follower, and the constant internal curve ensures smooth, unobstructed movement of the round stack. Anti-tilt follower stabilizes the stack to help prevent nose-diving and bolt-over-head failures. Heat-treated, stainless steel spring is stress-relieved for optimal performance. Withstands the heat from prolonged full-auto fire and is not harmed by most bore cleaners and solvents. Exterior ribbing provides added gripping surface; magazine catch notch, rather than a traditional hole, keeps dirt and debris out. Easy-to-grasp ledge on floorplate aids in extracting magazine from pouches; floorplate removes easily for cleaning. All models available in Black. DO NOT COME WITH DUST COVERS. The BCG is the M16-style BCG. It will not work with older Colt lowers that have the sear block.  

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  • AR-15 UPPER RECEIVER ASSEMBLY 7.5 More Detail

    AR-15 UPPER RECEIVER ASSEMBLY 7.5" 5.56 PISTOL RADICAL FIREARMS

    Click here for price!$239.99Click here for price!$239.99

    The Radical Firearms M4 Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This fully mil-spec compliant receiver provides a high-quality upper for any level budget or shooter. Comes complete and assembled with Forged Upper Receiver, Forward Assist, Ejection Port Door and Barrel Nut.  These uppers also come installed with Radical Firearm’s FGS Free Float handguard, which features QD points at various points along its round exterior.  Barrel is machined from 4150V chrome moly steel, melonited, has a 1-7 twist & is chambered in 5.56x45mm NATO.  Upper & barrel feature M4 feed ramps.   A2 flash hider is attached via ½-28 threads.  Pistol length gas system & 7” free float handguard.  DOES NOT INCLUDE BOLT CARRIER GROUP OR CHARGING HANDLE.

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  • AR-15 UPPER RECEIVER ASSEMBLY 5.56 SOCOM 16 More Detail

    AR-15 UPPER RECEIVER ASSEMBLY 5.56 SOCOM 16" MIDLENGTH RADICAL FIREARMS

    Click here for price!$239.99Click here for price!$239.99

    The Radical Firearms SOCOM Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This fully mil-spec compliant receiver provides a high-quality upper for any level budget or shooter. Comes complete and assembled with Forged Upper Receiver, Forward Assist, Ejection Port Door and Barrel Nut.  These uppers also come installed with Radical Firearm’s FGS Free Float handguard, which features QD points at various points along its round exterior.  Barrel is machined from 4150V chrome moly steel, melonited, has a 1-7 twist & is chambered in 5.56x45mm NATO.  Barrel has a SOCOM Government profile.  Upper & barrel feature M4 feed ramps.   A2 flash hider is attached via ½-28 threads.  Mid-length gas system & 12” handguard.  DOES NOT INCLUDE BOLT CARRIER GROUP OR CHARGING HANDLE.

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  • AR-15 80% LOWER RECEIVER BILLET NOREEN FIREARMS, LLC More Detail

    AR-15 80% LOWER RECEIVER BILLET NOREEN FIREARMS, LLC

    Click here for price!$54.99Click here for price!$54.99

    Noreen 80% Billet Aluminum AR-15 Receivers are ready for your next project. Machined from a solid piece of billet aluminum, ensuring maximum precision & material quality. Operations left to be completed are: fire control group, trigger pin, hammer pin, trigger slot, and safety selector. 80% Noreen Billet Lower is compatible with Modulus Arms 80% Jig (not compatible with Anderson jig). Noreen Jig Part #: 100-020-436 Returns will not be accepted once the receiver is modified in any way.

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  • BILLET AR-15 UPPER RECEIVER NOREEN FIREARMS, LLC More Detail

    BILLET AR-15 UPPER RECEIVER NOREEN FIREARMS, LLC

    Click here for price!$69.99Click here for price!$69.99

    Stripped Receiver 6061 Aluminum Type III Class II Hard Coat Anodized Features M4-type feed ramps Flattop 1913 Picatinny rail Abbreviated shell deflector and provision for ejection port cover Integral Shell Deflector Designed to accept Mil-Spec parts Tighter Tolerances than forged receivers Matte black finish Made in the USA

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  • AR-15 UPPER RECEIVER ASSEMBLY 300 BLACKOUT 8.5 More Detail

    AR-15 UPPER RECEIVER ASSEMBLY 300 BLACKOUT 8.5" RADICAL FIREARMS

    Click here for price!$239.99Click here for price!$239.99

    The Radical Firearms 300 Blackout HBAR Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This fully mil-spec compliant receiver provides a high-quality upper for any level budget or shooter. Comes complete and assembled with Forged Upper Receiver, Forward Assist, Ejection Port Door and Barrel Nut.  These uppers also come installed with Radical Firearm’s FGS Free Float handguard, which features QD points at various points along its round exterior.  Barrel is machined from 4150V chrome moly steel, melonited, has a 1- twist & is chambered in 300 Blackout.  Upper & barrel feature M4 feed ramps.   A2 flash hider is attached via 5/8-24 threads.  Pistol length gas system.  DOES NOT INCLUDE BOLT CARRIER GROUP OR CHARGING HANDLE.

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