.300 AAC Blackout

POF USA

POF USA P-415 EDGE Upper Receiver for 300 AAC Blackout - 10.5 inch with Black Anodized Finish

POF USA

POF USA Renegade+ Upper Receiver for 300 AAC Blackout with 10.5" Barrel

ATI

American Tactical Inc Milsport Complete Upper for 300 AAC Blackout with 15-Inch MLOK Handguard

Radian Weapons

Radian Weapons Model 1 Upper Receiver for 300 AAC Blackout - 9 inch Black Finish

Daniel Defense

Daniel Defense DDM4 300S URG 300 Blackout 10.3-inch Upper Receiver Assembly