My father passed away 4 years ago and left his firearms collection to me, after he passed I sorted through his collection sorting out what I would sell and keep. The majority of that end of it has been dealt with but there are a few oddballs still hanging around. One of these is a Springfield armory Sar-3 that until recently I didn't realize what it was. Originally I had just assumed it was some oddball HK-91 knockoff and cast it aside in the sell pile, so it sat for the last few years. Recently I was going back through things and took another look at it and realized it was missing the entire bolt assembly. So I did some research and realized it's an EBO copy of an HK 91 made in greece on HK tooling imported by springfield armory. Now my question is what do I do about replacing the bolt assembly? I also have an MP5 and HK 93, so I'm fairly familiar with HK's from shooting both of those but I've never done anything with guns from the G3/HK 91 rifles. I went through everything HK that I have and was able to find a bolt carrier for the but nothing else. Due to my unfamiliarity with the springfield clones of the HK 91 I have a few questions. Are G3 and HK 91 parts directly interchangeable? I know cetme parts aren't , am I better off just buying a complete bolt and bolt carrier assembly or trying to piece one together by adding parts to the bolt carrier I already have? and where are the best places to look for parts?