[Seth Ritzman]

I've been having problems with my STI 9mm 1911 going to slide lock with rounds left in the Mag. Cycling rounds through the gun it would happen on the 9th round in the mag. So I bent the little piece below the follower down to a 45 degree angle and that seemed to stop the problem when I was hand cycling the rounds. However, today at a match it happened once on the 9th round and once with about 4 rounds left in the mag. I am using Tripp Cobra mags. Initially I had to mill the mag bodies slightly because the mag body was engaging the slide stop.

Please any suggestions would be appreciated.

Seth

[G-ManBart]

If it happened with both 9 and around 4 rounds left in the mag, it doesn't sound like it's the follower engaging the slide stop lever too soon. Take the slide off the gun, put the slide stop lever back in the frame, put a mag loaded with either dummies or your normal ammo (obviously, be careful to not leave those around ) and see if the nose of the bullets might even be sorta close to the nose of the slide stop lever. They bounce around pretty good while moving upwards during feeding and if the side of a bullet hits the nose of the slide stop lever, it can raise it enough to engage the cutout in the slide.

As an added precaution, put a dimple in the face of the slide stop lever where the plunger contacts it. That will make it much harder for it to be accidentally pushed upwards, but will still allow it to work normally. R,

[Bill Nesbitt]

I put a little detent in the slide stop on one of mine to prevent that. It didn't take much.

Bill

[Beretta Lover]

I had a 9mm para ordnance that did this years ago

The slide stop was made of presumably low quality steel because it started to get peened and made contact with the inside of the slide itself. It was actually worn down enough to where the slide stop pin could move laterally just enough to tie up the gun at weird intervals.

It only did this when I shot it.

I replaced the slide stop with a Wilson and the problem went away.

I think the STI Trojan I have has a MIM slide stop, so my guess would be that your 1911 might too.

My older brothers P12 slide stop also died and was replaced this year, his problem was the slide stop was worn down enough to never engage the slide to lock it open.

We replaced the slide stop and it was good to go.

If its not the actual slide stop, it might be rounds nose diving into the ramp and stopping forward slide movement

This is pretty well documented here on Benos for STI Trojans, I had to have the ramp of my Trojan re welded by Virgil Tripp and now it runs 100%

[wurm]

That's the first thing I think I ever fixed on a 1911. I had a .45 Kimber that would do the same thing with certain hollowpoints and I did what G-ManBart recommended and put a mag in the frame without the slide on and sure enough, the bullets were awfully close to the slide stop. A few swipes with a file and life was good.

[Seth Ritzman]

I looked things over and the nose of the bullets could be hitting the slide stop intermitently. What is the recommended way to put a "detent" in the slide stop?

[G-ManBart]

Seth Ritzman, on Oct 18 2009, 10:54 PM, said:

I looked things over and the nose of the bullets could be hitting the slide stop intermitently. What is the recommended way to put a "detent" in the slide stop?

If the bullets could brush up against the slide stop I'd remove a bit off the nose with a dremel and a sanding wheel then smooth it up with one of the gray polishing wheels.

I've put a dimple in the slide stop a couple of ways. Once I know exactly where I want it, I'll take a pointy punch and make a tiny spot in the center of where I want the dimple and then use a round ball shaped cutter (carbide burr) on the dremel, but a small drill bit would work as well. The punch mark keeps the bit from wandering. It doesn't have to be deep and it doesn't have to be large since the contact spot is pretty small for that little plunger.

I've also hear of folks using a horizontal cut....sort of an oval slash rather than a circle.

This post has been edited by G-ManBart: 18 October 2009 - 08:12 PM

[DougCarden]

Seth, you will need to reduce the extension inside of the frame that is hitting on the bullet nose. You can use a file or dremel, just go really slow. If you dont know how or are uncomfortable find a smith to do it and show you how. What I do is to take the slide off, then put the slide stop in the frame. I then put a mag in with one round and see where it engages the slide stop. You can then mark the slide stop where the bullet rubs and then reduce the stop until it doesnt hit anymore and still locks back.
Good luck,
DougC