And this one swallowed up 150rds today with nary a hiccup on it's maiden voyage today. It's S/N H3xxx. Happy happy joy joy!
The other one I have (S/N H2xxx) it is VERY picky about ammo, with occasional extraction failures with everything except Silvertips, which run 100%.
The picky one seems to have an additional shape in the chamber, like a slight cone cut added at the top only, extending about 1/3 the way into the chamber. The new one that runs 100% has a straight-walled chamber all around. I wonder if that's the difference?.......