New G29 - slide locks back with last rnd still in magazine...

[DHart]

Any suggestions on how to solve this problem? Firing 180 gr. Rainier plated HP's in factory 10-rnd mags with Pearce pinky extension. The mag empties just fine until the last round, then the slide locks back after firing the next-to-last round, leaving the last round still in the magazine. I've noticed that my grip pressure on the Pearce tends to push the bottom of the mag rearward... could that be changing the angle of the bullet tip touching the slide stop lug? Should I take a smidge off the slide stop lug?

Glock 29, factory 10-round mags, KKM aftermarket barrel, LWD 3.5# connector, LWD Ultimate trigger stop, Pearce finger extension magazine accessory.

[Glock-N-Fun]

I've heard of that happening,if that bullet type looks like it's close to the tab on the lever,you might try marking that bullet(felt marker),then when the lever pop's up,remove it from the chamber and check for a smudge mark on the left side.