300 Blackout Upper Receivers

CMMG DISSENT Upper Receiver Mk4 300BLK 6.5in 1-7 Twist 5/8x24 Thread Zeroed Linear Compensator Coyote Tan

CMMG DISSENT Upper Receiver Mk4 300BLK 10.5in 1-7 Twist 5/8x24 Thread Zeroed Linear Compensator Tungsten

CMMG DISSENT Upper Receiver Mk4 300BLK 10.5in 1-7 Twist 5/8x24 Thread Zeroed Linear Compensator Coyote Tan

CMMG DISSENT, MK4, Complete Upper Receiver, 300 Blackout, 10.5 in Threaded Barrel, 5/8x24, CMMG Zeroed Linear Compensator, Cerakote Finish, Charcoal Green, M-LOK Free Float Handguard, Fits AR-15 Lower

CMMG Mk4 .300BLK Banshee Upper Group Receiver 8in 1-7 Twist 5/8 X 24 TPI 16.5in Midnight Bronze

CMMG Mk4 .300BLK Banshee Upper Group Receiver 8in 1-7 Twist 5/8 X 24 TPI 16.5in Coyote Tan

CMMG Mk4 .300BLK Banshee Upper Group Receiver 12.5in Tungsten

CMMG Mk4 .300BLK Banshee Upper Group Receiver 12.5in Titanium

CMMG Mk4 .300BLK Banshee Upper Group Receiver 12.5in Sniper Grey

CMMG Mk4 .300BLK Banshee Upper Group Receiver 12.5in Coyote Tan

CMMG Mk4 .300BLK Resolute Upper Group Receiver 16.1in Tungsten

CMMG Mk4 .300BLK Resolute Upper Group Receiver 16.1in Titanium

CMMG Mk4 .300BLK Resolute Upper Group Receiver 16.1in Midnight Bronze

CMMG Mk4 .300BLK Resolute Upper Group Receiver 16.1in Coyote Tan

CMMG Mk4 .300BLK Resolute Upper Group Receiver 16.1in Charcoal Green

Geissele Automatics Geissele Super Duty MOD1 .300 BLK 10.3" 1:7" CHF Chrome Lined Bbl DDC Complete Upper Receiver Group 08-554S

Geissele Automatics Geissele Super Duty MOD1 .300 BLK 10.3" 1:7" CHF Chrome Lined Bbl Black Complete Upper Receiver Group 08-554B

Troy 3AC Complete Upper Receiver 300 AAC Blackout 12.5" Barrel

DIAMONDBACK FIREARMS DB15 300Blk 16" 30rd FDE Rec Black Gold Lower

Moriarti AR-15 .300 AAC Blackout 6 inch Upper Receiver Medium Pistol Length 1-7 Twist 5/8x24 A2 Flash Hider Nitride Black

Moriarti Upper Receiver with Flash Hider AR-15 .300 Blackout 10.5 inch Barrel Medium Profile Pistol Length 1x7 Twist 5/8X24 Thread M-LOK Handguard A2

OP Exclusive Moriarti AR-15 Upper Receiver 300 Blackout 10.5in Pistol Medium M-LOK 1-7 Twist 5/8x24 Thread Diamond Cut Free-Float Handguard Triport

Moriarti AR-15 300 Blackout Diamond Cut 12in MLok Upper Assembly A2 Black 16in

Moriarti AR-15 .300 AAC Blackout 5 inch Upper Receiver Medium Micro Length 1-7 Twist 5/8x24 A2 Flash Hider Nitride