300 Blackout Upper Receivers

Moriarti Upper Receiver Stripped AR-15 .300 Blackout 10.5 inch Barrel Medium Profile Pistol Length 1x7 Twist 5/8X24 Thread M-LOK Handguard Mini Shroud

SIG SAUER SIGMCX 300 Blk SBR 5.5" Blk PDW Upper/Stock 30rd

Sig Sauer MCX .300 BLK 9" M-LOK AR Conversion Upper Receiver w/Tapered Lug UAMCX-9B-300B-TAP

Griffin Armament PSD AR-15 Pistol Complete Upper Receiver 300 AAC Blackout 9.5" Barrel

Sons of Liberty Gun Works M4-89 Complete Upper M489UPPER-10.5-300, 300 Blackout, 10.5 in Combat Barrel

AT3 Tactical Tactical AR-15 Slick Side Billet Upper Receiver Pink

AT3 Tactical AR-15 Slick Side Billet Upper Receiver Green

AT3 Tactical AR-15 Slick Side Billet Upper Receiver FDE

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 19.5in 10.5in Pistol 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish Bronze

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 19.5in 10.5in Pistol 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish Purple

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 19.5in 10.5in Pistol 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish Silver

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 19.5in 10.5in Pistol 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish Blue

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 17.5in 8.5in Pistol 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish

XTS Complete Upper Receiver w/o BCG AR-15 300 BO 24.75in 16in Barrel Carbine 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish

AR-STONER AR-15 Pistol Complete Upper Receiver 300 AAC Blackout 5" Barrel Pistol Length M-LOK Handguard

TacFire AR-15 .300 Blackout Unassembled Upper Receiver Kit - 5"

TALON TENGU HGA 300 BLK 7.5" 1:7 TWIST 7"MLOK RAIL BLADE 30RD MAG

Black Rain Ordnance Spec15 300 Blackout 10.5 Barrel 12 Hybrid Handguard NB Bolt Complete Upper

Black Rain Ordnance Spec15 300 Blackout 10.5 Barrel 15 Hybrid Handguard NB Bolt Complete Upper

Black Rain Ordnance BROROTRM30A Spec15 M30A ROTR 300 Blackout 30+1 7.50 Black Nitride Threaded BBL, M-LOK Handguard, Badlands Cerakote Alum Pic Rail Rcvr, Black SB Tactical SBA3 Brace, Black G.I. Grip, Right Hand,Tactical Pistols

STEYR ARMS 300 AAC Blackout Kit

Maxim Defense Industries MDX 508 U.R.G. AR-15 .300 AAC Blackout 8.5 inch Upper Receiver Pistol Length 1-7 Twist 5/8x24 HATEBRAKE Arid

Maxim Defense Industries MDX 505 PDX/SCW Compatible URG Upper Receiver 300 BLK NATO Hate Brake 5/8-24 Thread 5.5in Barrel Arid Earth

Anderson Manufacturing AM-15 Utility 300 Blackout Complete Upper Receiver with 16 Inch Barrel and 15 Inch Handguard