300 Blackout Upper Receivers

LMT MRP Rifle Length AR-15 Quad Rail Upper Receiver

NBS 7.5" Slick Side Billet 300 BLK Nitride Pistol M-LOK Upper Assembly

One Horse 7.5" .300 BLK SOCOM Pistol 1:7 M-LOK Complete Upper

One Horse 16" .300 BLK SOCOM Pistol 1:7 M-LOK Complete Upper

10.5 .300BLK Phosphate Pistol M-LOK Heavy Upper Assembly

Daniel Defense DDM4 PDW .300 BLK 7" Pistol 1:7 Complete Upper Receiver

LMT MRP-L M-LOK AR-15 Upper Receiver - 8.25"

LMT MRP-L M-LOK AR-15 Upper Receiver - 9.25"

Sons of Liberty Gun Works M4-89 300 BLK AR-15 Upper - 9"

M4-Exo3 300 Aac Blackout Assembled Upper Receiver - M4-Exo 300 Aac Blackout 13.9'''' Bbl 13'''' Exo3 Rail W/Nox Brake

Sons of Liberty Gun Works M4-EXO3 300 BLK AR-15 Upper - 10.5"

Sons Of Liberty Gun Works East India Starter Kit .300 BLK Barreled Upper - 16"

Rainier Arms / Rellim Arms AR-15 300BLK Take Down Upper Receiver Assembly - 8"

Rainier Arms RUC DI 300BLK Partial Upper Receiver - 10.7"

Primary Weapons Systems 300 BLK MK109 MOD 1-M Complete Upper - 9.75"

PSA "Sabre" Forged 8.5".300 Blackout Nitride 10" Suppressor-Ready Knurled Rail

PSA "Sabre" Forged 10.5" .300 Blackout Nitride 10" Knurled Slant Rail and Sabre Compensator

PSA JAKL 8.5" 300 BO NATO 1/8 Nitride MOE EPT w/ Brace, FDE

PSA JAKL,8.5" 300BO NATO Nitride, With BCG, Bolt Catch and Bolt Catch roll Pin, Smoke

PSA JAKL,8.5" 300BO NATO Nitride, With BCG, Bolt Catch and Bolt Catch roll Pin, FDE

PSA JAKL,8.5" 300BO NATO Nitride, With BCG, Bolt Catch and Bolt Catch roll Pin

PSA 8.5" Pistol-length 300AAC Blackout Nitride 7" Lightweight M-Lok Upper - No BCG or CH

PSA 7" 300AAC Blackout MOE "Marauder" Pistol Upper - NO BCG or CH

PSA 8.5" Pistol-length 300AAC Blackout Nitride 7" Lightweight M-Lok Upper - No BCG or CH