M4 5.56 UPPER RECEIVER GROUPS
Cartridge:
AKK_5.56 mm NATO
Twist:
1-7
Style:
Complete
Finish:
Anodized
Contour:
Carbine
Length:
11.5''
Color:
Black
Make/Model:
AR-15
Make:
AR-15
Muzzle:
1/2-28
