Modular and accurate are key points of the CMMG Mk4 B18 AR-15 semi auto rifle. This high quality modern sporting rifle features a 18" bull barrel made of 416 stainless steel with a target crown. The CMMG RKM11 KeyMod hand guard provides all the needed real estate for any mission-critical accessories. The rifle has a mid-length gas system resulting in a lighter recoil impulse and faster follow up shots.

Specifications and Features
CMMG 55A6398
5.56 NATO (also accepts .223 Remington)
Mid length gas system
Semi automatic
18" 416 stainless steel bull barrel
Target crown
1:7" twist
30 rounds capacity
7075-T6 upper and lower receiver
Mil-spec single stage trigger
RKM11 KeyMod hand guard
A2 pistol grip
Polymer collapsible M4 stock
Overall length 36"
Weight 7.65 lbs
Black