AR15 Upper Receivers

CMMG UPPER GROUP RESOLUTE MK4 for AR-15 with 16.1-Inch Steel Barrel in Creakoted Armor Black Finish

CMMG

CMMG UPPER GROUP RESOLUTE MK4 - .223 Rem/5.56 NATO, 16.1-Inch Steel Barrel with Matte Black Finish

CMMG

FAXON ASCENT COMPLETE 5.56

Faxon Firearms

ALEXANDER UPPER RECEIVER KIT

Alexander Arms

AERO PRECISION M5 COMPLETE

AeroPrecision

AERO PRECISION M4E1T COMPLETE APAR700305M7

AeroPrecision

Stern Defense 015-SD15MOD4MLOK1619MMKK 9mm Complete Upper - 16.1" Barrel

Stern Defense

Stern Defense 015-SD10MOD5MLOK8.59MM-KK 9mm Pistol Upper

Stern Defense

Alexander Arms UTA-65 AR15 Tactical Upper - 6.5 Grendel

Alexander Arms