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Old 02-06-2020, 10:34 PM
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tex_n_cal tex_n_cal is offline
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Classic 10mm premature slide lock back

I've worked on this pistol a lot to correct feeding issues. I've now got it feeding well, except for one final problem - it keeps locking the slide open with rounds still in the magazine. It will do it with Kimber, CMC, and Wilson 10mm mags. I've changed the slide stop for an Ed Brown, and that didn't fix it, either - nor did trying a variety of ammo. Suggestions? I'd like to fix it as it shoots very accurately.
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Old 02-06-2020, 11:52 PM
emptymag emptymag is offline
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Are you left-handed?
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Old 02-07-2020, 10:12 AM
KCJeep KCJeep is offline
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Does it do it with "real" 10mm ammo or is it just the glorified 40 watered down stuff?
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Old 02-07-2020, 01:37 PM
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Not left handed, and yes I have used a variety of ammo, including handloads with 155's at 1400 fps.
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Old 02-08-2020, 11:17 PM
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Sometime the projectile comes up and rubs the slide into the up or lock position. This is a frequent issue with Ultra models. Do you shoot round nosed ammo or ammo with a projectile that is wide near the tip?
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Old 02-09-2020, 08:54 PM
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I typically shoot hollowpoints in it.

In this case I sat down & studied the fit of the slide stop to the magazine. I think some of the bullet noses were hitting the SS, and causing it to prematurely lock back the slide. I stoned the original Kimber slide stop, taking about .015" off the end, and that seemed to fix the problem. Needs more testing, but 60 rounds with no malfunctions is a big improvement. If it goes through a few hundred rounds with no more failures, then I'll consider it fixed
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Old 02-09-2020, 08:59 PM
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Wilsonedbrown Wilsonedbrown is offline
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I would say the rounds are contacting the Slide stop while feeding and pushing it up. this is a common problem IMO. you should be able to see where the nose of the bullets are leaving copper marks on the slide stop if this is the issue..
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