I have an old Rock river arms lower, had it for years. It won't fit any of my mil spec uppers, the rear pin is too narrow, I was going to file a small portion away till the upper fit.
My question is, once I get the upper to fit, will my bolt work in the commercial buffer tube? What pitfalls am I looking at?
My question is, once I get the upper to fit, will my bolt work in the commercial buffer tube? What pitfalls am I looking at?
