I have a FLGR on my TRP that I am sick of. I want to swap out to a standard GI setup but don't know if just any drop-in part will work for my gun. And if so who makes the best standard parts. Will I need Springfield to do it? I know that my TRP is not a custom gun, but it does have some minor hand fitted parts, so does that mean that modifications need to be made to swap it out? Any help from you guys who have swapped out one yourselves would be greatly appreciated.