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 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 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 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 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 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

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

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

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

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

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 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

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

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

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

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

DEMO Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant 1-7 Twist 1/2 x 28 Thread Compensator Black STAG15101013

DEMO Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant 1-7 Twist 1/2 x 28 Thread Compensator Black STAG15101013. Made to mil-spec standards with a removable A3 carry handle and a rifle length thermoplastic handguard... ... more

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 10.5 in RA-RUC-PRO-MK2-105-PU

Rainier Arms Ruc Pro Mk2 5.56 Nato Partial Upper Receiver Black 10.5 in RA-RUC-PRO-MK2-105-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

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 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel 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 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 handguard with... ... 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 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

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

Aagil Arms Ted Nugent's Signature Series 5.56 NATO AR-15 Upper Receiver Assembly w/ 15in Cobra Style Handguard Gun Black Cerakoted AA-CURK16556C15TNGB

Aagil Arms Ted Nugent's Signature Series 5.56 NATO AR-15 Upper Receiver Assembly w/ 15in Cobra Style Handguard Gun Black Cerakoted AA-CURK16556C15TNGB. Ted Nugent. This is only one model out of 3 in Ted Nugent's Signature Series. This upper assembly is... ... 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

Aagil Arms Complete AR-15 5.56 NATO Upper Assembly 16in Barrel Length Carbine 1-7 Twist w/ 15in M-Lok Anodized Black Medium AA-C16556C7K15

Aagil Arms Complete AR-15 5.56 NATO Upper Assembly 16in Barrel Length Carbine 1-7 Twist w/ 15in M-Lok Anodized Black Medium AA-C16556C7K15. 5.56 NATO. 16" Barrel. Carbine Gas System. 15" M-Lok Handguard. Charging Handle and Canvas Gun Sleeve Included.... ... more

Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant 1-7 Twist 1/2 x 28 Thread Compensator Black STAG15101013

Stag Arms AR-15 Retro Right Hand Upper Receiver 5.56 NATO 20in Barrel NJ Compliant 1-7 Twist 1/2 x 28 Thread Compensator Black STAG15101013. Made to mil-spec standards with a removable A3 carry handle and a rifle length thermoplastic handguard with... ... 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

XTS Complete Upper Receiver w/o BCG AR-15 223/5.56 24.75in 16.5in Carbine 1-8 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish XTS-CU-16BK

XTS Complete Upper Receiver w/o BCG AR-15 223/5.56 24.75in 16.5in Carbine 1-8 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish XTS-CU-16BK. 56 upper comes FULLY ASSEMBLED with a 5.56 NATO barrel capable of shooting both .223 and 5.56. These XTS... ... more

XTS Complete Upper Receiver w/o BCG w/ 12in Rail AR-15 223/5.56 24.75in 16.5in Carbine 1-8 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish

XTS Complete Upper Receiver w/o BCG w/ 12in Rail AR-15 223/5.56 24.75in 16.5in Carbine 1-8 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish. 5in AR15 5.56 upper comes FULLY ASSEMBLED with a 5.56 NATO barrel capable of shooting both .223 and... ... more

XTS Complete Upper Receiver w/o BCG AR-15 223/5.56 16.5in 7.5in Pistol 1-7 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish Red XTS-CU-7RD

XTS Complete Upper Receiver w/o BCG AR-15 223/5.56 16.5in 7.5in Pistol 1-7 Twist 1/2x28 Thread M-LOK Bird Cage Black Nitride Finish Red XTS-CU-7RD. 56 16.5in upper comes FULLY ASSEMBLED with a 5.56 NATO barrel capable of shooting both .223 and 5.56.... ... more