I was at the range yesterday and met someone using a AR15, I looked at his rifle noticing that it had something on its FH. I told him he had some kind of gunk on his FH and he said it was JB WELD. I asked him why, and he said he uses it to permanently installs his FH that way. Upon further investagation he said he put its on the bbl threading and threads on the FH, since it would be extremely permanent enough even if you had to do some work on the rifle you couldnt even get it off. I would like to think of it as being extremely permanent but would like to hear from you guys if this is considered legal ways to attach a flash hider. and also would like to know if using JB WELD for blind pins is legal also?
(example).......drilling the FH, drilling the bbl, placing pin inside, covering it with JB WELD, and then touching it up with paint................. it does say "hard as steel"