Ruger Mk II 22/45.
First off - had to have a gun smith buddy replace the bolt stop pin for me. My meager tools and skill couldn't drift the appropriate pin out in order to swap the 1-piece factory stop pin with the MA two-piece pin.
Gun is now fully assembled. YAY! Trigger pulls, hammer falls, everything resets. Safety works. Hand-cycled 10 rounds of LRN through it...all works as it should.
So then I go to try out the speed strip. I unscrew the thing (bolt closed) - no issues. Get the piece out of the top of the gun - no problem other than a bit of tension from the bolt/spring.
Pull the bolt out - no problem. Put the bolt in - slight issue of needing enough pressure to slide over the top of the new MA hammer (more round profile so the bolt can slide over).
But for the life of me, the 2-piece MA bolt stop pin just won't screw back together. Won't. Go.
It won't screw together with the bolt in - nor with the bolt removed. Tension or no tension. Pushing hard from the top down or not. Just. won't. screw together.
Everything SEEMS lined up from the bottom. And even if it were off by half a MM or so, I'd think that the threads would align themselves into being "true" - but I can't get the blasted thing even STARTED, let alone all the way together.
Making me feel like a dunce, for sure.