300 Blackout Upper Receivers

One Horse OH-15 Complete Pistol Upper .300 AAC Blackout 7.5 Barrel

One Horse OH-15 Complete Pistol Upper .300 AAC Blackout 10.5 Barrel CH BCG

Radian Weapons Model 1 Complete Upper Gray .223 Wylde 14.5 P&W Barrel

AR-STONER T-Series Unassembled AR-15 Pistol Kit 10.5" 300 AAC Blackout

AR-STONER AR-15 Pistol Kit 7.5" Barrel 300 AAC Blackout

TacFire AR Build Kit for AR Pistol Platform .300 Blackout 10.5 Barrel

Radian Weapons Model 1 Complete Upper Gray .223 Wylde 16 Barrel

AR-STONER AR-15 Pistol Complete Upper Receiver 300 Blackout 8" Barrel

Maxim Defense PDX AR-15 Complete Upper Receiver 300 AAC Blackout 5.5" Barrel Arid

Noveske N4 Engraved AR-15 Ejection Port Cover Noveske Cross

LMT Defense MRP-L M-LOK SPECWAR Assembled Upper 5.56

LMT Defense MRP-L Quad Assembled Upper Receiver 5.56/300 BLK 13.25

CMMG Dissent 6.50" Upper .300 AAC Blackout with 1:7 Twist Rate and M-LOK Rail - Pistol-Length with Charging Handle - Armor Black - 30B0E67AB

FOSTECH RAPTOR 7.5" 300BO GRY

Wilson Combat AR-15 Ejection Port Dust Cover 300BLK Black

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 300 AAC Blackout 8" Barrel 7.3" ATLAS R-ONE Handguard Black

LMT Defense MRP-L Quad Assembled Upper Receiver 5.56/.300 Blackout

CMMG Resolute Mk4 DISSENT Upper Group .300 AAC Blackout 14.5 P&W Barrel

AR-STONER AR-15 Pistol Complete Upper Receiver 300 AAC Blackout 8" Barrel Pistol Length M-LOK Handguard

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 300 AAC Blackout 8" Barrel 7.3" ATLAS R-ONE Handguard Flat Dark Earth

Noveske Chainsaw Complete Upper .300 AAC Blackout 8 Barrel

Aero Precision AR-15 M4E1-T Barreled Upper Receiver 300 AAC Blackout 10" Barrel 9.3" ATLAS R-ONE Handguard Black

Radian Weapons Model 1 Complete Upper Gray .300 AAC Blackout 9 Barrel

DPMS Kitty Kat Complete Upper .300 AAC Blackout 7.5 Threaded Barrel