About 550 rounds total through pistol. Divided by about 5 mags. 3-12 round 1-10round and 1- 15 round. This started to happen after 330 shots, when I first installed the extended mag release and Icarus grip module. Fixed before I shot it again by changing out wedge. After firing the next 120 rounds (included in 550, but first time using the module and extended mag release) the problem came backPete, how many rounds through the pistol? Just to get some perspective on the wear you're experiencing.