I don't know of the bolt size and am away from home so I can't even measure one of my spares, but I do have something relevant to the question. Be very careful with the length of screw you end up using, if it is too long it will interfere with the safety. I put a magpul moe grip on my norinco and I can't remember if it was the provided screw or the original screw I ended up using but one made the safety not function.



























