AR15 Upper Receivers

CMMG Upper Group Resolute MK4 with 14.5-inch Steel Barrel in Black Finish

CMMG

CMMG Resolute MK4 Upper Group with 14.5-Inch Barrel in .223 Rem/5.56 NATO

CMMG

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

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