instaled a mark X trigger on a 1932 peruvian action, but can't lift bolt unless trigger is loose, instaled .065 shim between receiver and trigger housing and works perfect. I can't jar sear to make it fire, just wondering if this is a common problem,as I've never had it happen before.

I'm not familiar with the Mark X trigger. I do know that if you set a Timney with too little over travel, you end up with the problem you've described. Try backing the over travel screw out a bit and see if the problem goes away.

That Mkx trigger is designed for a commercial speedlock sear not the military sear. The notches are different. Need to either get a Timney trigger or a commercial speedlock sear from a Mkx.

Thanks guys , appreciate the info.