Last round jam redux

[9teeneleven]

Some may remember the funky thread title from the last time I posted with this problem, albeit with a different gun. I am having a feeding problem on the last round of my kimber 1911 stainless ii, and only on the last round. The gun has just over 500 rounds through it, and it has recently developed a problem of jamming on the last round of the mag, with the round not getting into the chamber. My first though was ok mag spring problem. It started happening with a wilson combat mag that has about 250 rounds on it. This is my first suspicion that something other than the mag is amiss, simply do the the great rep these mags have, and the low round count in particular seems to suggest that a spring may not be the problem. Well low and behold, this happened again on the last range visit, except this time with the kimber 7rd mag, then also with a remington rand mag.

I've put in an order for some extra power wolff springs, but what else could cause a failure to feed other than the mag. Surely, I have not had two new mags come with bunk springs. The third mag is admittedly 66 years old, but it works flawlessly in the remington.

Edited July 26, 2009 by 9teeneleven

[TripleDigitRide]

Could be a few things.

I'll start with the easiest; have you tried polishing the feed ramp?

[9teeneleven]

ramp on both the frame and the barrel appear to be in good shape. It is a strange jam, I should have taken a picture, but it seems like the round is getting jammed going into the extractor, and wedging there.