OK...never mind! When I really examined the parts, I realized I mixed up an AR15 bolt hold-back with the 15-22 part. Putting the correct part back in solved the problem. When will I learn to not work on two weapons at the same time??
A-G
The last round (in any of my six OEM mags) will chamber but will not fire. It is not being struck by the firing pin as it has absolutely no mark on the rim although the hammer has been released and is down. The round will eject when the charging handle is pulled back...and the bolt will lock...
CZ85...then drop in a competition hammer and the short reset modification from Cajun Gun Works. Much, much better than both of my HPs...even after their trips to Cylinder and Slide.
When I first tightened the coupler it compressed the (factory 25-rd)mags and the follower would not pass the coupler. When I loosened it up, the mags started sliding. After a bit of tightening/loosening I found the "sweet spot"...the follower isn't fouled and the mags are stable. No problems...