300 Blackout Upper Receivers

Grid Defense Complete Upper Receiver .300 Blackout 16 inch Pistol Length 4150 Light HBAR Barrel 1-8 Twist 14 inch M-LOK Rail A2 Flash Hider Blue

Grid Defense Complete Upper Receiver .300 Blackout 10.5 inch Pistol Length 4150 Steel Light HBAR Barrel 1-8 Twist 10.5 inch Hand Guard A2 Flash Hider

Grid Defense Complete Upper Receiver .300 Blackout 10.5 inch Pistol Length 4150 Steel Light HBAR Barrel 1-8 Twist 10.5 inch Hand Guard A2 Flash Hider

Grid Defense Complete Upper Receiver .300 Blackout 10.5 inch Pistol Length 4150 Steel Light HBAR Barrel 1-8 Twist 10.5 inch Hand Guard A2 Flash Hider

Ghost Firearms Vital Complete Upper Receiver .300 Blackout 7.5in Pistol Length 4150 Light HBAR Barrel 1-8 Twist 7in M-LOK Free Float Hand Guard A2

Ghost Firearms Vital Complete Upper Receiver .300 Blackout 10.5in Pistol Length 4150 Light HBAR Barrel 1-8 Twist 9in M-LOK Free Float Hand Guard A2

VG6 Precision Gamma 300BLK

One Horse Complete Upper Receiver .300 Blackout 7.5" Barrel 7" M-LOK Handguard Nitride BCG & Charging Handle

One Horse Complete Upper Receiver .300 BLK 10.5" with BCG and Charging Handle

TacFire 16" Unassembled .300 Blackout Rifle Build Kit with Lower Parts Kit

Tacfire Complete Upper with BCG .300 Blackout 8" Black

Tacfire Complete Upper with BCG .300 Blackout 5" Black

TacFire Complete Upper with BCG .300 Blackout 16" Black

Anderson Manufacturing AM-15 Stripped Upper Receiver Black

ATI AR15 Multiple Caliber Stripped Metal Reinforced Polymer Upper Receiver

ATI Milsport Complate Upper .300 BLK 8.5" Barrel 7" M-LOK Handguard & Polymer Flip-Up Sights

ATI Milsport Complate Upper .300 BLK 16'' Barrel 15" M-LOK Handguard & Polymer Flip-Up Sights

AR-STONER AR-15 Enhanced Build Kit with Upper Receiver Assembly 300 AAC Blackout 16" Barrel Pistol Length M-LOK Handguard, Complete Lower Parts Kit with Magpul MOE Furniture Black

Complete AR15 Upper Receiver - 300 Blackout - 13.9" Barrel - 13" MLOK

KAK Complete AR15 Upper Receiver - 300 Blackout - 13.9" Barrel - 13" MLOK - 4 Prong Pin and Weld

Complete AR15 Upper Receiver - 300 Blackout - 16" Barrel - 15" MLOK

KAK Complete AR15 Upper Receiver - 300 Blackout - 4.75" Barrel - 5.5" MLOK

KAK Complete AR15 Upper Receiver - .300 Blackout - 8.5" Barrel -7.2" MLOK

KAK Complete AR15 Upper Receiver - 300 Blackout - 10.5" Barrel - 9.8" MLOK