That's odd, mine is a stock internal gen4 minus the flat face trigger and minus connector (Glock parts). I've run 1,000 rounds of magtec 115 grain, 1,000 Speer lawmen 124 grain, 300 rounds of geco 124 grain, couple hundred rounds of American eagle 115 grain, couple hundred of 115 grain Atlanta arms, and none had issues. The gun loves 147 grain HST for duty loads. I'm planning on swapping out the RSA and do so every 3k. Also I run mine wet as my other Glocks, I've probably cleaned it twice which is more of a wipe down and relube with slip 2000.