Used HK-91 Value

It really depends. There is the PSG-1 conversion, and the MSG-90. If it is a re-barreled conversion, with the PSG-1 trigger pack, receiver reinforcing rails, etc., $3500 would be a good start, depending on who did the work. If it's a William's trigger pack, stock barrel, and one of the PSG/MSG stocks $1800-ish. It's really variable, at the moment, since the JLD's are extremely high quality, the only benefit to the "HK" being the stamp, at this point. Get the most info you can on exactly what has been put in, and who did it, and post on www.hkpro.com -they'll give you the best answer.

Forgot to add- the scope mount should be ARMS, or HK stamped. Anything else isn't guaranteed true to spec. For a HK "target/sniper" it should have Schmidt&Bender, Khales, Swairovski, or high-end Leupold glass. Lots of people have "plain" 91's and have been prettying them up, to jack the cash vale. I love Burris, but putting one on a true PSG-1 build would be like putting retreads on your Porsche.