Yeah they ground the hell out of the bottom of the hammer under the sear on my M327, where it seats into the trigger groove. The grinding offset the angle of the trigger mechanism causing the trigger spring assembly to raise up from the frame after about 15-20 trigger pulls and then eject the sear spring. It was a royal cluster F. Unless they replace the trigger assembly and possibly the hammer assembly on yours completely they will be better off just sending you a replacement. It could be that the frame pins were off on yours like mine and they tried a grind and file to get it to work. Doesn't seem to be much of a win win approach and kind of a shame since they went to the trouble of replacing the barrel. Probably explains why they replaced the hand. Maybe they thought the hand was off and when that didn't fix it they commenced to hack away at the trigger and hammer assemblies. Stopped at some point becuase they probably had a stack of other guns to fix and gave it a "this will do" without test firing it and then back to you.