Rock River Arms Completed Upper Receiver, Predator HP A4, .308/7.62x51mm NATO, 20 Inch Barrel, 1-10 Twist, Free-Float Handguard, Brake, Black, 308A0567

Rock River Arms 14.5in R4 CL 1-7 Full Auto Barrel, Black, AR0242

Rock River Arms Completed Upper Receiver, CLB .458 SOCOM, 16 Inch Barrel, 1-14 Twist, 5/8-32 Threat, Free-Float Handguard, Brake, Black, SOC0820.V1

Rock River Arms Upper Receiver, EOP .223 Wylde, 20 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0560

Rock River Arms Completed Upper Receiver, Varmint A4, .308/7.62x51mm NATO, 20 Inch Barrel, 1-10 Twist, Free-Float Handguard, Black, 308A0551

Rock River Arms 10.5in CL 1-7 Full Auto Barrel, Black, AR0241

Rock River Arms BT-3 Completed Upper Receiver, 6.5mm Creedmoor, 32In, 24in Barrel, Standard SS Fluted Profile, 1-10 Twist, 5/8X24 Thread, M-LOK Handguard, Black, 65C0578BT

Rock River Arms 14.5in CL 1-9 Barrel Assembly, Black, AR0199ASY

Rock River Arms Completed Upper Receiver, Coyote Carbine .223/5.56Mm, 16 Inch Barrel, 1/2-28 Thread, Free-Float Handguard, Vortex Flash Hider, Black, AR0592

Rock River Arms Upper Receiver, A4 .223 Wylde, 24 Inch Barrel, Varmint Profile, 1-12 Twist, Free-Float Handguard, Black, AR0576

Rock River Arms Upper Receiver, A4 .223 Wylde, 20 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0550

Rock River Arms BT-3 Completed Upper Receiver, 6.5mm Creedmoor, 28In, 20in Barrel, Standard SS Fluted Profile, 1-10 Twist, 5/8X24 Thread, M-LOK Handguard, Black, 65C0568BT

Rock River Arms 24in SS Varmint 1-12 Barrel, Stainless Steel, AR0229

Rock River Arms Completed Upper Receiver, A4, .450 Bushmaster, 20 Inch Barrel, 1-24 Twist, 5/8-32 Thread ,Free-Float Handguard, Brake, Black, 450B0587

Rock River Arms Upper Receiver, EOP .223 Wylde, 18 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0530