The M76 is built on a milled receiver, so they don't use trunions like a standard AK. the kits were originally brought in as completed rifles by SOG 2 years ago, but ATF classified them as F/A because they had the sear trip in them, so they were recalled, de-milled and resold as kits without any receiver parts. The bolt will lock up in an M-70 trunion, I have one I'll include with the other parts, the kit might be used with a Romanian PSL receiver, they use the same type of trunions, or possibly a bent blank? . Thanks much.