I picked up a HK91 IB date code a few months back from a guy that is the original owner and just never used it (or cleaned it apparently). It has some rust on it here and there in hard to reach places (around FSB, in creases etc...). And I was toying with the idea of having it completely striped down and refinished by one of the HK guys and doing the paddle mag mod. My other issue with it is that it has some pitting inside the barrel. It looks pretty rough in a spot about 4-5" from the muzzle. I want to run my SDN6 can on it but I'm afraid the pitting might cause a baffle strike. I really want to rebarrel it with an original HK barrel but I can't seem to find one. I'd hate to screw up the value of the rifle by rebarreling it with a US made barrel but in this case it seems necessary. If I end up going this route I was thinking of having the barrel cut from its original length to 14.5" and having my 51T blackout permantly attached to it. This rifle is a shooter and no safe queen but I have serious reservations about refinishing it and replacing the barrel. If I go with these mods am I going to screw with the value much?