Atlantic Firearms Host Guns
As a long time gun collector and NFA collector (50years) these guys have the best that I have seen for host guns. The money I have spent was well worth it, the quality is outstanding. I have three host guns with more than 2-3 thousand rounds each and no issues. I don't shoot my HK rifles any more since the prices are crazy and now they are investment guns. My advice is to by a sear and a ton of clones. The quality is outstanding because of technology. HK rifles are getting very expensive to fix. From what I hear, I think that PTR now has the HK machinery.