I had a similar problem with my Springfield 1911 when I first got it, thing wouldnt always come back to full battery after firing a round and you had to "help" it by giving it a bump on the rear of the slide. I thought I needed to do some polishing, mag changing, etc... I took it to a good friend who is a gunsmith of 30+ years and he laughed at me. Said "put 1000 rounds through it of ball ammo, if that don't fix it, I'll buy you a brand new one". So i took the old timer up on the deal, bought 1000 rounds of ball 45 acp and spent the next 2 days at the range. The problem resolved itself within about 350 rounds, but i muscled through the rest to be sure. Granted this was 6 years ago when ammo wasn't stupidly high priced and I wish I had stopped at 400 rounds and kept the other 600, but hindsight sure ain't foresight... I have never had any such problem with the pistol since and have put every kind of ammo I can find through it since. Just my .02, don't polish until it has been broken in well enough to be sure that it just didnt need to learn how to work!!!