[geetarman]

I wish I had thought of moving the bolt fore and aft with the trigger pulled or not and checking for feel.

I probably would have if it had been my rifle but it is not. I will mention it to them the next time I see them.

Thanks for the tip. The only other thing I can think of would be a slightly oversize hole that permits a small amount of movement if the trigger is held back as opposed to one being released quickly.

I can't think of another thing that would cause this problem.