I have an older witness P carry model. Comes with 3 slides and mags. .45acp- 40s&w- 9mm. It is the king of jamming. With the .45 it jams in the middle of the 8rd mag, say rounds 4 and 6, every time. Failure to feed is the problem. Same issue shooting with the 9mm slide. The 40s&w however jams....every.....single....round.....!!! Fail to feed, fail to feed! I've polished the ba-jesus out of the feed ramps on the barrels, no change. I have several mags for each caliber, no change in reliability with every mag I have. Any thoughts?