12-26-2021, 05:03 AM
It's a Bootleg Inc rail. I think it's actually made by BCM and uses one of BCM's barrel nut wrenches. I like it but it was a bit of extra work to get it on since it is a thermal fit. I bought the two Grendel ejection port covers probably five or six months ago and until yesterday I'd only installed the one on the 20" Grendel since I just didn't want to deal with having to pull the Bootleg rail. I will say that it's rock solid though so I guess that's the trade off of having to deal with thermal fitting a rail.