300 Blackout Upper Receivers

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

CMMG Mk4 .300BLK Banshee Upper Group Receiver 12.5in Midnight Bronze

CMMG Mk4 .300BLK Resolute Upper Group Receiver 16.1in Sniper Grey

TRYBE Defense AR-15 .300 AAC Blackout 16in Complete Upper Receiver Pistol Length 1-7 Twist 5/8x24 A2 Black

Troy 300AAC Caliber SOCC Rail Handguard A4 Upper Receiver Kit 12.5in w/Sights Black

Moriarti Complete Upper Receiver AR-15 .300 AAC Blackout 16 inch Barrel Medium Profile Pistol Length 1x7 Twist 5/8X24 Thread M-LOK Handguard Triport

OP Exclusive Moriarti AR-15 Upper Receiver 300 Blackout 16in Pistol Medium M-LOK 1-7 Twist 5/8x24 Thread Diamond Cut Free-Float Handguard Triport

Sig Sauer MCX .300 BLK 16" M-LOK AR Conversion Upper Receiver w/Tapered Lug UAMCX-16B-300B-TAP

COLONIAL ARMAMENT WOLVERINE MK-20

AT3 Tactical AR-15 Slick Side Billet Upper Receiver Black

XTS Complete Upper Receiver w/o BCG w/ 12in Rail AR-15 300 BO 24.75in 16in Barrel Carbine 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish

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 OD Green

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 Red

XTS Complete Upper Receiver w/o BCG w/ Ce Rail AR-15 300 BO 17.5in 8in Barrel 1-8 Twist 1/2x28 Thread M-LOK Bird Cage Black Finish

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

APF Armory .300 AAC Blackout Fury Complete Upper Receiver Armor Black

TALON TENGU HGA 300 BLK 7.5IN 1:8 TWIST BLK 7IN MLOK RAIL BLADE 30RD MAG

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

Anderson Manufacturing Utility 300 Blackout Complete Upper Receiver with 10.5 Inch Barrel

Sons of Liberty Gun Works SOLGW M4-L89 .300BLK 13.9"Bbl Broadsword Upper Rifle M4-L89BS-300-13.9

Anderson AM-15 Forged AR15 Matched Receiver Set

GEMTECH Integra 300 Blackout Titanium Suppressor Upper

V Seven LR Enlightened 300Blkout Complete Upper 8.25in 8.25LR ENLI300SBR-UR

AT3 Tactical AR-15 Slick Side Billet Upper Receiver Tungsten