woodweasel58
Member
I just recieved all of the parts fora new build. I want to use the 7" free float forearm from one of my JR Carbine 9mm's then replace it with a 12" forearm. The problem is the JRC 9mm is a blow back and doesn't use a gas tube. The barrel nut only has 4 holes. If I put it on my new build 1 of those 4 holes has to line up for the gas tube. I guess what I want to know is if there is anyone who knows if and which quad rails use the same barrel nut threads and which ones have proprietary barrel nut threads? Help please.