Did you get this from 762SASS? If so, he should be able to tell you what to modify to make Fwd. assist work. It uses an AR15 assist. If you install it and it protrudes into the bolt carrier space then it will need to be modified. I don't know more than that. There is a thread on this subject on AR15.com in the Armalite AR10 & 180 forum. I have one of his blem receivers on my carbine but I don't use a Fwd. assist, I just plug the hole. I like it and will get another for a second upper build if he still has them when i have funds.
I used a vinyl shipping cap from some from some 3/8" copper tubing. There is rumored to be purpose built aluminum plugs for this but I haven't found them. When I have time I'll sit down at the lathe and make one.
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