Quote from: Duck of Death on February 26 2017 02:32:59 PM MST
Here's the situation, G29/3, 10 round mag, #4 mag follower, Wolff 21lb uncaptured recoil spring, 180gr cast bullet w/13gr #9, oal 1.250, the slide locks open w/1 round left in mag. Thumb IS NOT pushing the slide release up on recoil. I bent the slide release spring to increase tension--still locks open.

Any thoughts??

Afternoon Duck of Death

I have seen that happen on Glocks shooting snappy rounds & having an extended slide lock lever.

Any chance that your gun has a longer extended slide lock? That extra length adds more weight farther from the fulcrum so makes it easier for recoil to move it into slide lock.

Evening ron556

I just went through this same 10mm want/need/can afford a short while ago.

The STI has it's likers & complainers just like many other 10mm 1911 offerings.

I kind of ruled out the SIG early on as it has an internet full of problems.

I also ruled out the Colt & RIA early on as the Colt doesn't have a ramped barrel & the RIA (I looked at 3) didn't seem to have the build quality & looks quality that I was looking for.

I found a couple of Dan Wesson 10mm that I liked but the price was a bit above what I was looking to pay. Even then I would have probably bought the Wesson if it came in the color combinations that appealed to me. 

I pretty well looked at all 1911's that I could find &  it boiled down to price/vs/quality/vs/usefulness.

I then stumbled across the NEW (2017) Kimber Eclipse Custom series 1 (yep, the new 2017 Eclipse is now a series 1 with no Swartz safety).

I'm still on the fence about my buying decision.  The Kimber is a super looking gun that comes with a ramped barrel, night sights, & is extremely accurate.

I have had some feeding issues & premature slide lock back issues but a little extractor tuning & some new parts sent from Kimber & it seems to be functioning OK for now.

The accuracy I am getting (as good as my Wilson 45 & Baer 38 super) is outstanding, the lock-up is tight but doesn't seem to be a lot of care at parts tuning during assembly.