300 Blackout Upper Receivers

Complete AR15 Upper Receiver - 300 Blackout - 16" Barrel 13" - MLOK

NBS 8.5" .300 BLK Pistol M-LOK Upper Assembly

NBS 16" 300 BLK Nitride Carbine M-LOK Upper Assembly

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

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

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

Brn-180 Scnr 300 Blackout 9" Complete Upper Receiver Assembly - Brn-Scnr 300blk 9''''bbl Upper Receiver Black

Brn-180sA(R) 300blk Upper With Vortex Sparc Solar Red Dot - Brn-180s 300blk Upper W/Sparc Solar Red Dot

16" 300 BLK Nitride Carbine M-LOK Upper Assembly

Anderson Stripped Sport Upper Receiver - Black

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 10.5" .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

Aero PrecisionM4E1 Threaded Complete Upper 8" .300 Blackout Barrel ATLAS R-ONE 7" M-LOK HG - FDE Cerakote

Aero Precicion M4E1 Threaded Complete Upper 8" .300 Blackout Barrel 7" M-LOK ATLAS S-ONE Handguard - FDE Cerakote

Sons of Liberty Gun Works 16" M4-89 Upper

Radical Firearms 16" 300 Blackout Complete Upper Assembly

Sons of Liberty Gun Works EXO3 16" .300 BO Upper

Sharps Bros. SBUR04 Billet Upper Receiver

Radical Firearms 8.5" 300 Black Out Complete Upper Assembly

Radical Firearms 10.5" 300 Black Out Complete Upper Assembly