If the barrel is properly indexed, tab wear won't cause stovepiping, even if the slide jumps track. Realistically, there are three things that cause 90% of stovepiping; a short recoil spring, a bad or cruded up extractor or a broken ejector/ejector spring. I've "smithed" nearly a hundred carbines. In every case where stovepiping was the problem, it was one of those three causes.