Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 16 in RA-MK1-16-PU-BLK

Aero Precision Ar15 Comp Assembled Upper 5.56 Nato Carbine Barrel W/Pinned Fsb - 5.56 Assembled Uppe

AR15 Assembled Upper, 5.56 Nato Carbine Barrel W/Pinned Front sight base MOE SL or MOE SL ML Carbine Handguard - Black Available in 10.5" or 16" barrel. 10.5" Upper Features: Upper: Standard AR15 Upper Receiver Barrel: 10.5" 5.56 Carbine Barrel w/... ... more

Aero Precision Ar15 Comp Assembled Upper 5.56 Nato Carbine Barrel W/Pinned Fsb - 5.56 Assembled Uppe

AR15 Assembled Upper, 5.56 Nato Carbine Barrel W/Pinned Front sight base MOE SL or MOE SL ML Carbine Handguard - Black Available in 10.5" or 16" barrel. 10.5" Upper Features: Upper: Standard AR15 Upper Receiver Barrel: 10.5" 5.56 Carbine Barrel w/... ... more

Aero Precision Ar15 Comp Assembled Upper 5.56 Nato Carbine Barrel W/Pinned Fsb - 5.56 Assembled Uppe

AR15 Assembled Upper, 5.56 Nato Carbine Barrel W/Pinned Front sight base MOE SL or MOE SL ML Carbine Handguard - Black Available in 10.5" or 16" barrel. 10.5" Upper Features: Upper: Standard AR15 Upper Receiver Barrel: 10.5" 5.56 Carbine Barrel w/... ... more

Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver Black 10.5 in RA-RUC-DI-10C-PU

Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver Black 10.5 in RA-RUC-DI-10C-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a direct impingement operating system on their new... ... more

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 12.5 in RA-RUC-PRO-MK2-125-PU

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 12.5 in RA-RUC-PRO-MK2-125-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a Rainier Arms Low Pro nonadjustable gas... ... more

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 12 in RA-RUC-PRO-MK1-RS-12-PU

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 12 in RA-RUC-PRO-MK1-RS-12-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a Rainier Arms Low Pro nonadjustable gas... ... more

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 11.5 in RA-RUC-PRO-MK1-RS-115-PU

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 11.5 in RA-RUC-PRO-MK1-RS-115-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a Rainier Arms Low Pro nonadjustable... ... more

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 10.5 in RA-MK1-10.5-PU-BLK

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 10.5 in RA-MK1-10.5-PU-BLK. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a Rainier Arms Low Pro nonadjustable gas... ... more

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 11.5 in RA-MK1-11.5-PU-BLK

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 11.5 in RA-MK1-11.5-PU-BLK. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a Rainier Arms Low Pro nonadjustable gas... ... more

Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver Black 14.5 in RA-RUC-DI-14M-PU

Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver Black 14.5 in RA-RUC-DI-14M-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a direct impingement operating system on their new... ... more

Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver 16in Black Medium RA-RUC-DI-16M-PU

Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver 16in Black Medium RA-RUC-DI-16M-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a direct impingement operating system on their... ... more

Rainier Arms Rellim Arms AR-15 5.56 Nato Take Down Upper Receiver Assembly Black 16 in RA-TDURA-556-16

Rainier Arms Rellim Arms AR-15 5.56 Nato Take Down Upper Receiver Assembly Black 16 in RA-TDURA-556-16. Utilizing Rellims patented quick detach upper receiver and barrel nut system and Rainiers quality parts its a match made in heaven. Whether you want... ... more

Stag Arms AR-15 Tactical Left Hand Upper Receiver 5.56 NATO 16in Barrel Hanson Profile 1-7 Twist 1/2 x 28 Thread VG6 Delta Nitride Black STAG15110142

Stag Arms AR-15 Tactical Left Hand Upper Receiver 5.56 NATO 16in Barrel Hanson Profile 1-7 Twist 1/2 x 28 Thread VG6 Delta Nitride Black STAG15110142. The handguard provides an uninterrupted picatinny rail along the top which allows room for sights... ... more

Stag Arms AR-15 Upper Left Hand Receiver 5.56 NATO 16in Barrel NJ Compliant M4 Profile1-7 Twist 1/2 x 28 Thread Compensator Black STAG15111113

Stag Arms AR-15 Upper Left Hand Receiver 5.56 NATO 16in Barrel NJ Compliant M4 Profile1-7 Twist 1/2 x 28 Thread Compensator Black STAG15111113. Made to mil-spec standards this upper satisfies the need for a standard GI carbine. Featuring a 5.56x45mm... ... more

Rainier Arms RUC DI 5.56 NATO Complete Upper 16in Black Medium RA-RUC-DI-16M-CU

Rainier Arms RUC DI 5.56 NATO Complete Upper 16in Black Medium RA-RUC-DI-16M-CU. Bringing the highest quality parts to the market while offering the best value as well. This complete upper utilizes a direct impingement operating system on their new and... ... more

Stag Arms AR-15 Upper Right Hand Receiver 5.56 NATO 16in Barrel NJ Compliant M4 Profile 1-7 Twist 1/2 x 28 Thread Compensator Black STAG15101113

Stag Arms AR-15 Upper Right Hand Receiver 5.56 NATO 16in Barrel NJ Compliant M4 Profile 1-7 Twist 1/2 x 28 Thread Compensator Black STAG15101113. Made to mil-spec standards this upper satisfies the need for a standard GI carbine. Featuring a 5.56x45mm... ... more

Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel GOV Profile 1-7 Twist 1/2 x 28 Thread A2 Birdcage Flash Hider Black STAG15101011

Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel GOV Profile 1-7 Twist 1/2 x 28 Thread A2 Birdcage Flash Hider Black STAG15101011. Made to mil-spec standards with a removable A3 carry handle and a rifle length thermoplastic... ... more

Rainier Arms Ruc Di 300BLK Partial Upper Receiver Black 10.7 in RA-RUC-DI-300BLK-10-7-PU

Rainier Arms Ruc Di 300BLK Partial Upper Receiver Black 10.7 in RA-RUC-DI-300BLK-10-7-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a direct impingement operating system on our... ... more

Rainier Arms Select 5.56 NATO Barrel 16in 1-7 Twist 1/2x28 Black Medium RAB-SEL-556-16-M-NF-BLK

Rainier Arms Select 5.56 NATO Barrel 16in 1-7 Twist 1/2x28 Black Medium RAB-SEL-556-16-M-NF-BLK. They are able to reach our goal by sourcing a very high end barrel blank at an affordable price. They start off using a high precision match blank in 1:7... ... more

Battle Arms Development Workhorse 16in 5.56 Nato Upper Receiver Assembly No Bcg No Ch WH-UR-16-556

Battle Arms Development Workhorse 16in 5.56 Nato Upper Receiver Assembly No Bcg No Ch WH-UR-16-556. 56 NATO Twist Rate: 1:7 Barrel Extension: M4 Diameter at Gas Block: .750 Gas Block Type: Low-profile Muzzle Device: A2 Flash Hider Receiver Material:... ... more

Stag Arms AR-15 Tactical Right Hand Upper Receiver 5.56 NATO 16in Barrel Hanson Profile 1-7 Twist 1/2 x 28 Thread VG6 Gamma Black STAG15100144

Stag Arms AR-15 Tactical Right Hand Upper Receiver 5.56 NATO 16in Barrel Hanson Profile 1-7 Twist 1/2 x 28 Thread VG6 Gamma Black STAG15100144. The handguard provides an uninterrupted picatinny rail along the top which allows room for sights optics and... ... more

Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant GOV Profile 1-7 Twist 1/2 x 28 Thread Compensator Black

Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant GOV Profile 1-7 Twist 1/2 x 28 Thread Compensator Black. Made to mil-spec standards with a removable A3 carry handle and a rifle length thermoplastic handguard with... ... more

Stag Arms AR-15 Upper Right Hand Receiver 5.56 NATO 16in Barrel M4 Profile 1-7 Twist 1/2 x 28 Thread A2 Birdcage Flash Hider Black STAG15101111

Stag Arms AR-15 Upper Right Hand Receiver 5.56 NATO 16in Barrel M4 Profile 1-7 Twist 1/2 x 28 Thread A2 Birdcage Flash Hider Black STAG15101111. Made to mil-spec standards this upper satisfies the need for a standard GI carbine. Featuring a 5.56x45mm... ... more

Stag Arms AR-15 Upper Left Hand Receiver 5.56 NATO 16in Barrel Maryland Compliant HBAR Profile 1-7 Twist 1/2 x 28 Thread A2 Birdcage Flash Hider Black

Stag Arms AR-15 Upper Left Hand Receiver 5.56 NATO 16in Barrel Maryland Compliant HBAR Profile 1-7 Twist 1/2 x 28 Thread A2 Birdcage Flash Hider Black. Made to mil-spec standards this upper satisfies the need for a standard GI carbine. Featuring a... ... more

DEMO Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant GOV Profile 1-7 Twist 1/2 x 28 Thread Compensator Black

DEMO Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant GOV Profile 1-7 Twist 1/2 x 28 Thread Compensator Black. Made to mil-spec standards with a removable A3 carry handle and a rifle length thermoplastic handguard with... ... more

Dark Storm Industries DS-15 Complete Upper 16" MOE 5.56 Non-Threaded Black 5.56 DSI-UC5-MOE-N5-BLK

Dark Storm Industries DS-15 Complete Upper 16" MOE 5.56 Non-Threaded Black 5.56 DSI-UC5-MOE-N5-BLK. Specifications for Dark Storm Industries DS-15 16" MOE 5.56 Upper Receiver: Manufacturer: Dark Storm Industries Cartridge: 5.56x45mm NATO Barrel Length:... ... more

Dark Storm Industries DS-15 Complete Upper 16" MOE 5.56 Threaded Black 5.56 DSI-UC5-MOE-T5-BLK

Dark Storm Industries DS-15 Complete Upper 16" MOE 5.56 Threaded Black 5.56 DSI-UC5-MOE-T5-BLK. Specifications for Dark Storm Industries DS-15 16" MOE 5.56 Upper Receiver: Manufacturer: Dark Storm Industries Cartridge: 5.56x45mm NATO Barrel Length: 16... ... more

Rainier Arms Mountain MOD2 5.56 NATO Barrel 16in 1/2x28 Mid Len Black Medium RAB-CMV-556-16-M-HF-BLK

Rainier Arms Mountain MOD2 5.56 NATO Barrel 16in 1/2x28 Mid Len Black Medium RAB-CMV-556-16-M-HF-BLK. We have brought back our Mountain Series of barrels for those of you who want the accuracy you expect from Rainier Arms in a nearly indestructible... ... more

CBC Industries AR-15 Upper Assembly 5.56 NATO 16in 1-8 12in Tactical Keymod Black 160-604

CBC Industries AR-15 Upper Assembly 5.56 NATO 16in 1-8 12in Tactical Keymod Black 160-604. It isbuilt around a 16 inch 4150 chrome moly barrel and has a black nitride finish. The upper receiver is a forged M4 flat top upper allowing you to easily... ... more

POF USA Renegade 5.56 Upper 16.5in Barrel 9 Position Direct Impingement Dictator 14.5in Rail Black Anodized 00907

POF USA Renegade 5.56 Upper 16.5in Barrel 9 Position Direct Impingement Dictator 14.5in Rail Black Anodized 00907. 56 Specifications for POF USA Renegade Upper Receiver: Manufacturer: POF USA Cartridge: 5.56x45mm NATO Barrel Length: 16.5 in Muzzle... ... more

Stag Arms AR-15 Tactical Right Hand Upper Receiver 5.56 NATO 7.5in Barrel GOV-CMV Profile 1-7 Twist 1/2 x 28 Thread VG6 Delta Nitride Black

Stag Arms AR-15 Tactical Right Hand Upper Receiver 5.56 NATO 7.5in Barrel GOV-CMV Profile 1-7 Twist 1/2 x 28 Thread VG6 Delta Nitride Black. The handguard provides an uninterrupted picatinny rail along the top which allows room for sights optics and... ... more

Stag Arms Stag 15L Tactical Pistol 7.5in Nitride Complete Upper Receiver - Flash Hider 5.56 NATO Pistol-Length 7in M-LOK 1-7 Rifled Left Black

Stag Arms Stag 15L Tactical Pistol 7.5in Nitride Complete Upper Receiver - Flash Hider 5.56 NATO Pistol-Length 7in M-LOK 1-7 Rifled Left Black. 5in uppers are chambered in 5.56 NATO and built around a 7.5in 1/7 twist barrel Stag 7in M-LOK SL Handguard... ... more

Stag Arms AR-15 Retro Left Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant GOV Profile 1-7 Twist 1/2 x 28 Thread Compensator Black STAG15111013

Stag Arms AR-15 Retro Left Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant GOV Profile 1-7 Twist 1/2 x 28 Thread Compensator Black STAG15111013. Made to mil-spec standards with a removable A3 carry handle and a rifle length thermoplastic... ... more

Rainier Arms MK12 223 Wylde Partial Upper Receiver Black 18 in RA-MK12-DI-18R-PU

Rainier Arms MK12 223 Wylde Partial Upper Receiver Black 18 in RA-MK12-DI-18R-PU. Bringing the highest quality parts to the market while offering the best value as well. This partial upper build utilizes a Precision Reflex GEN III free float handguard... ... more

Franklin Armory OPS-16 5.56 NATO 16in Piston Complete Upper Reciever Black 00-40078-BLK

Franklin Armory OPS-16 5.56 NATO 16in Piston Complete Upper Reciever Black 00-40078-BLK. 56 NATO 16in Piston Complete Upper Reciever was created to function as the ideal product for anyone looking for an exceptional selection.. Developed working with... ... more

Rock River Arms Completed Upper Receiver Predator HP A4 .308/7.62X51mm NATO 16 Inch Barrel 1-10 Twist Free-Float Handguard Brake Black 308A0578

Rock River Arms Completed Upper Receiver Predator HP A4 .308/7.62X51mm NATO 16 Inch Barrel 1-10 Twist Free-Float Handguard Brake Black 308A0578. 308/7.62X51mm NATO Completed Upper. Formulated by using several of the most robust and long lasting... ... more

XTS Complete Upper Receiver w/o BCG w/ Ce Rail AR-15 .223/5.56 16.5in 7.5in Barrel Pistol 1-7 Twist 1/2x28 Thread M-LOK Bird Cage Black Finish

XTS Complete Upper Receiver w/o BCG w/ Ce Rail AR-15 .223/5.56 16.5in 7.5in Barrel Pistol 1-7 Twist 1/2x28 Thread M-LOK Bird Cage Black Finish. 5in 5.56 upper comes FULLY ASSEMBLED with a 5.56 NATO barrel capable of shooting both .223 and 5.56. These... ... more