So, the retainer pin in my bolt carrier group scares me. When I first got the rifle, my gun dealer showed me how to disassemble and oil the group, and had trouble getting the pin back in, so he hammered it, so now it has a hammered-looking top. I still have to hammer it some to get it in, so if anything it’s getting flatter.
Since I started shooting my rifle, the pin looks corroded to me. It feels brittle to me, but it is so far staying in one piece, that does take all the hammering I have to do to get it into position.
My question is: Is this normal? Does it need to be replaced? If it does, where would I look, and what should I look for?