Bought an early production, used 4.25 prior owner installed an EGW ignition set.
I adjusted trigger weight to my preference.
Installed a Dawson ext firing pin and new wolf FP spring.
Adjusted extractor
It runs like a scalded dog! Thank goodness.
Runs 124 FMJ's, HAP's, RMR TC, and Bayou, Hoosier 124 coated.
Been running STI Gen1 & 2 mags mostly, but the factory mags run also.
Know this doesn't help you but the three I'm around , two friends, seem to run.
So keep at it
I'm running 1.150 OAL on Bayou and Hoosiers 1.169 FMJ's, and 1.050 on RMR TC
good fortune