I have a YHM 13" quad rail on my AR (CMMG) and thinking about going to a 15" mod rail that weights less. Being piston driven how much more clearance do you need for the piston?
When I put that rail on I called YHM and they said that the only rail that would work on that guns was model XXXX.
I put a BCM on another AR and like it so much I was thinking about one for the CMMG.
When I put that rail on I called YHM and they said that the only rail that would work on that guns was model XXXX.
I put a BCM on another AR and like it so much I was thinking about one for the CMMG.
