Quarter Circle 10 45 ACP Complete Upper Receiver w/ PMUR 16in Barrel .578-28 15in HG FH Black QC-CU-G45-16

Quarter Circle 10 45 ACP Complete Upper Receiver w/ PMUR 5.5in Barrel .578-28 5.5in HG FH Black QC-CU-G45-5.5

Quarter Circle 10 45 ACP Complete Upper Receiver w/ PMUR 5.5in Barrel .578-28 5.5in HG FH Black QC-CU-G45-5.5. Leader in top of the line dedicated AR15 Pistol Caliber parts. This product is not compatible with DI gas systems or rifle-caliber bolts.... ... more

Quarter Circle 10 45 ACP Complete Upper Receiver w/ PMUR 7.5in Barel .578-28 7.5in HG FH Black QC-CU-G45-7.5

Quarter Circle 10 45 ACP Complete Upper Receiver w/ PMUR 7.5in Barel .578-28 7.5in HG FH Black QC-CU-G45-7.5. Leader in top of the line dedicated AR15 Pistol Caliber parts. This product is not compatible with DI gas systems or rifle-caliber bolts.... ... more

Quarter Circle 10 .40 SW Barrel 16in .578-28 Thread Black Nitride QC-BRL-40-16

Quarter Circle 10 .40 SW Barrel 16in .578-28 Thread Black Nitride QC-BRL-40-16. 40 S&W barrels are threaded for the attachment of flash hiders suppressors and accessories and finished with a nearly indestructible protective treatment. Barrels have a... ... more

Aero Precision M5 Complete Upper Receiver 16in .308 CMV Mid Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Flat Dark Earth APAR538115M22

Aero Precision M5 Complete Upper Receiver 16in .308 CMV Mid Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Flat Dark Earth APAR538115M22. 308 CMV Complete Upper Receiver w/ ATLAS S-ONE Handguard. This upper by Aero Precision features an ATLAS S-ONE... ... more

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 16in 5.56 Mid-Length Barrel 15in M-LOK ATLAS R-ONE Handguard Anodized

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 16in 5.56 Mid-Length Barrel 15in M-LOK ATLAS R-ONE Handguard Anodized. By combining our lightest handguards and barrel profiles with the No Forward Assist Upper Receiver... ... more

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 16in 5.56 Mid-Length Barrel 15in M-LOK ATLAS S-ONE Handguard Anodized

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 16in 5.56 Mid-Length Barrel 15in M-LOK ATLAS S-ONE Handguard Anodized. By combining our lightest handguards and barrel profiles with the No Forward Assist Upper Receiver... ... more

Aero Precision M4E1 Mid Barrel Complete Upper Receiver w/Flash Hider AR-15 5.56x45mm NATO 16in Mid Length Barrel 15in Quad Rail Handguard No BCG/CH

Aero Precision M4E1 Mid Barrel Complete Upper Receiver w/Flash Hider AR-15 5.56x45mm NATO 16in Mid Length Barrel 15in Quad Rail Handguard No BCG/CH. 56 Mid Barrel Complete Upper Receiver with Flash Hider is an amazing option. Designed to give you the... ... more

Aero Precision M4E1 Mid Barrel Complete Upper Receiver w/Flash Hider AR-15 5.56x45mm NATO 16in Mid Length Barrel 15in M-LOK Handguard No BCG/CH Magpul

Aero Precision M4E1 Mid Barrel Complete Upper Receiver w/Flash Hider AR-15 5.56x45mm NATO 16in Mid Length Barrel 15in M-LOK Handguard No BCG/CH Magpul. 56 Mid Barrel Complete Upper Receiver with Flash Hider is an amazing option. Designed to give you... ... more

Aero Precision M5 Complete Upper Receiver 16in .308 CMV Mid Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Black APAR538105M22

Aero Precision M5 Complete Upper Receiver 16in .308 CMV Mid Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Black APAR538105M22. 308 CMV Complete Upper Receiver w/ ATLAS S-ONE Handguard. This upper by Aero Precision features an ATLAS S-ONE handguard... ... more

Aero Precision M5 Complete Upper Receiver 16in .308 Mid Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Black APAR538705M22

Aero Precision M5 Complete Upper Receiver 16in .308 Mid Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Black APAR538705M22. Our proprietary ATLAS attachment system is a durable and dependable mounting platform maintaining a slim profile while still... ... more

Aero Precision Complete Upper Receiver M4E1-T 5.56 16in Mid-Length Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth APAR700315M7

Aero Precision Complete Upper Receiver M4E1-T 5.56 16in Mid-Length Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth APAR700315M7. 56 Mid Pencil Barrel w/ ATLAS S-ONE Handguard Complete Upper Receiver. These AR15 Upper Receivers built by... ... more

Aero Precision AR15 No FA Complete Upper 16in .223 Wylde Fluted Barrel Mid-Length 15in M-LOK ATLAS R-ONE HG Anodized Black APAR610605M50

Aero Precision AR15 No FA Complete Upper 16in .223 Wylde Fluted Barrel Mid-Length 15in M-LOK ATLAS R-ONE HG Anodized Black APAR610605M50. 223 Wylde Fluted Barrel Complete Upper Receiver. These AR15 Upper Receivers developed by Aero Precision are only... ... more

Aero Precision AR15 No FA Complete Upper 16in .223 Wylde Fluted Barrel Mid-Length 15in M-LOK ATLAS S-ONE HG Anodized Black APAR610505M50

Aero Precision AR15 No FA Complete Upper 16in .223 Wylde Fluted Barrel Mid-Length 15in M-LOK ATLAS S-ONE HG Anodized Black APAR610505M50. 223 Wylde Fluted Barrel Complete Upper Receiver. These AR15 Upper Receivers developed by Aero Precision are only... ... more

Quarter Circle 10 Side Charging Complete 45 ACP Upper Receiver Assembly 10.5in Barrel Black QC-CU-PSCU-G-45-10.5

Quarter Circle 10 Side Charging Complete 45 ACP Upper Receiver Assembly 10.5in Barrel Black QC-CU-PSCU-G-45-10.5. The patent-pending left side charging handle will allow you to charge your .45ACP cartridges out of the side of your receiver without fear... ... more

Quarter Circle 10 .45 ACP Barrel 16in Black Nitride QC-BRL-45-16

Quarter Circle 10 .45 ACP Barrel 16in Black Nitride QC-BRL-45-16. 45 ACP Barrel to ensure you're shooting with maximum precision. These Rifle Barrels made by Quarter Circle 10 are designed with a QPQ nitride finish for superior strength and corrosion... ... more

Aero Precision Complete Upper Receiver M4E1-T .300 16in Blackout Barrel 15in M-LOK ATLAS S-ONE Handguard Anodized Black APAR700305M14

Aero Precision Complete Upper Receiver M4E1-T .300 16in Blackout Barrel 15in M-LOK ATLAS S-ONE Handguard Anodized Black APAR700305M14. 300 Blackout w/ ATLAS S-ONE Handguard Complete Upper Receiver. Aero Precision built these AR15 Upper Receivers with... ... more

Quarter Circle 10 Side Charging Complete 45 ACP Upper Receiver Assembly 16in Barrel Black QC-CU-PSCU-G-45-16

Quarter Circle 10 Side Charging Complete 45 ACP Upper Receiver Assembly 16in Barrel Black QC-CU-PSCU-G-45-16. The patent-pending left side charging handle will allow you to charge your .45ACP cartridges out of the side of your receiver without fear of... ... more

Aero Precision Complete Upper Receiver M4E1-T .300 16in Blackout Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth APAR700315M14

Aero Precision Complete Upper Receiver M4E1-T .300 16in Blackout Barrel 15in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth APAR700315M14. 300 Blackout w/ ATLAS S-ONE Handguard Complete Upper Receiver. Aero Precision built these AR15 Upper... ... more

Quarter Circle 10 Side Charging Complete 45 ACP Upper Receiver Assembly 7.5in Barrel Black QC-CU-PSCU-G-45-7.5

Quarter Circle 10 Side Charging Complete 45 ACP Upper Receiver Assembly 7.5in Barrel Black QC-CU-PSCU-G-45-7.5. The patent-pending left side charging handle will allow you to charge your .45ACP cartridges out of the side of your receiver without fear... ... more

Quarter Circle 10 Complete 9mm Upper w/ PMUR 5.5in Barrel 1/2 - 28 5.5in HG FH Black QC-CU-G9-5.5

Quarter Circle 10 Complete 9mm Upper w/ PMUR 5.5in Barrel 1/2 - 28 5.5in HG FH Black QC-CU-G9-5.5. 355 Caliber Features of Quarter Circle 10 Complete 9mm Upper w/ PMUR: QC10 Billet Rear Charging Upper Receiver 9x19mm QPQ Nitride-Treated Barrel... ... more

Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly 16in Barrel Black QC-CU-PSCU-G-9-16 Inch

Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly 16in Barrel Black QC-CU-PSCU-G-9-16 Inch. 355 Caliber Features of Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly: QC10 Side Charging Upper Receiver Compatible... ... more

Aero Precision M4E1 Gen 2 Complete Upper Receiver 18in .223 Wylde Fluted Barrel Atlas S-ONE 15in M-LOK HG Anodized W/BCG/CH Black APAR900003

Aero Precision M4E1 Gen 2 Complete Upper Receiver 18in .223 Wylde Fluted Barrel Atlas S-ONE 15in M-LOK HG Anodized W/BCG/CH Black APAR900003. 56 Barrel Complete Upper Receiver. While Aero Precision built these AR15 Upper Receivers these specific ones... ... more

Aero Precision M5 Complete Upper Receiver 16in .308 Mid SS Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Flat Dark Earth APAR538715M23

Aero Precision M5 Complete Upper Receiver 16in .308 Mid SS Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Flat Dark Earth APAR538715M23. Our proprietary ATLAS attachment system is a durable and dependable mounting platform maintaining a slim... ... more

Aero Precision M4E1 Mid Barrel Complete Upper Receiver w/Flash Hider AR-15 5.56x45mm NATO 16in Mid Length Barrel 15in Quad Rail Handguard No BCG/CH

Aero Precision M4E1 Mid Barrel Complete Upper Receiver w/Flash Hider AR-15 5.56x45mm NATO 16in Mid Length Barrel 15in Quad Rail Handguard No BCG/CH. 56 Mid Barrel Complete Upper Receiver with Flash Hider is an amazing option. Designed to give you the... ... more

Quarter Circle 10 Complete 9mm Upper w/ PMUR 10.5in Barrel 1/2 - 28 10.5in HG FH Black QC-CU-G9-10.5

Quarter Circle 10 Complete 9mm Upper w/ PMUR 10.5in Barrel 1/2 - 28 10.5in HG FH Black QC-CU-G9-10.5. 355 Caliber Features of Quarter Circle 10 Complete 9mm Upper w/ PMUR: QC10 Billet Rear Charging Upper Receiver 9x19mm QPQ Nitride-Treated Barrel... ... more

FM Products FM-45 AR Upper Receiver w/ Micro Brake .45 Caliber 10 inch 8.5in Barrel Ultralight ProfileFlash Supressor Black FM45-FS-109

FM Products FM-45 AR Upper Receiver w/ Micro Brake .45 Caliber 10 inch 8.5in Barrel Ultralight ProfileFlash Supressor Black FM45-FS-109. 45 ACP .45 Glock or another 45cal pistol magazine you can feed these FM Products FM-45 Complete Uppers designed by... ... more

Quarter Circle 10 Side Charging Complete 45 ACP Upper Receiver Assembly 5.5in Barrel Black QC-CU-PSCU-G-45-5.5

Quarter Circle 10 Side Charging Complete 45 ACP Upper Receiver Assembly 5.5in Barrel Black QC-CU-PSCU-G-45-5.5. The patent-pending left side charging handle will allow you to charge your .45ACP cartridges out of the side of your receiver without fear... ... more

Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly 5.5in Barrel Black QC-CU-PSCU-G-9-5.5 Inch

Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly 5.5in Barrel Black QC-CU-PSCU-G-9-5.5 Inch. 355 Caliber Features of Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly: QC10 Side Charging Upper Receiver Compatible... ... more

Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly 7.5in Barrel Black QC-CU-PSCU-G-9-7.5 Inch

Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly 7.5in Barrel Black QC-CU-PSCU-G-9-7.5 Inch. 355 Caliber Features of Quarter Circle 10 Side Charging Complete 9mm Upper Receiver Assembly: QC10 Side Charging Upper Receiver Compatible... ... more

Aero Precision M4E1 Complete Upper Receiver 5.56 Barrel w/ FSB EM-7 HG No BCG/Charging Handle Anodized Black 10.5in APAR600211M3

Aero Precision M4E1 Complete Upper Receiver 5.56 Barrel w/ FSB EM-7 HG No BCG/Charging Handle Anodized Black 10.5in APAR600211M3. Key features include the addition of quick disconnect sling sockets enhanced milling design for grip and visual appeal and... ... more

Aero Precision M4E1 Complete Upper Receiver 5.56 Barrel w/ FSB EQ-7 HG No BCG/Charging Handle Anodized Black 10.5in APAR600211Q3

Aero Precision M4E1 Complete Upper Receiver 5.56 Barrel w/ FSB EQ-7 HG No BCG/Charging Handle Anodized Black 10.5in APAR600211Q3. Key features include the addition of quick disconnect sling sockets enhanced milling design for grip and visual appeal and... ... more

Quarter Circle 10 Complete 9mm Upper w/ PMUR 7.5in Barrel 1/2 - 28 7.5in HG FH Black QC-CU-G9-7.5

Quarter Circle 10 Complete 9mm Upper w/ PMUR 7.5in Barrel 1/2 - 28 7.5in HG FH Black QC-CU-G9-7.5. 355 Caliber Features of Quarter Circle 10 Complete 9mm Upper w/ PMUR: QC10 Billet Rear Charging Upper Receiver 9x19mm QPQ Nitride-Treated Barrel... ... more

Aero Precision M5 Complete Upper Receiver 16in .308 Mid SS Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Black APAR538705M23

Aero Precision M5 Complete Upper Receiver 16in .308 Mid SS Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Black APAR538705M23. Our proprietary ATLAS attachment system is a durable and dependable mounting platform maintaining a slim profile while... ... more

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 16in 5.56 Mid Pencil Barrel 15in M-LOK ATLAS R-ONE Handguard Anodized

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 16in 5.56 Mid Pencil Barrel 15in M-LOK ATLAS R-ONE Handguard Anodized. By combining our lightest handguards and barrel profiles with the No Forward Assist Upper Receiver... ... more

Aero Precision M5 Complete Upper Receiver 16in .308 Mid Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Flat Dark Earth APAR538715M22

Aero Precision M5 Complete Upper Receiver 16in .308 Mid Barrel w/ATLAS R-ONE 15in M-LOK Handguard Anodized Flat Dark Earth APAR538715M22. Our proprietary ATLAS attachment system is a durable and dependable mounting platform maintaining a slim profile... ... more

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 16in 5.56 Mid Pencil Barrel 15in M-LOK ATLAS S-ONE Handguard Anodized

Aero Precision AR-15 5.56x45mm NATO Complete Upper Receiver w/ No Forward Assist 16in 5.56 Mid Pencil Barrel 15in M-LOK ATLAS S-ONE Handguard Anodized. By combining our lightest handguards and barrel profiles with the No Forward Assist Upper Receiver... ... more

Aero Precision M5 Complete Upper Receiver 16in .308 SS Mid Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Black APAR538105M23

Aero Precision M5 Complete Upper Receiver 16in .308 SS Mid Barrel w/ATLAS S-ONE 15in M-LOK Handguard Anodized Black APAR538105M23. 308 SS Complete Upper Receiver w/ ATLAS S-ONE Handguard. Aero Precision built these AR Handguards & Rails with a front... ... more