1911 Slide Lockback mid-magazine

[Lurp]

Well I searched and couldn't find this problem addressed so I thought I'd ask. I have a Kimber Custom II and I've been having problems with the slide locking back after about 2 rounds. I have 1 Wilson 47D 8rd and 4 Chip McCormick 8rd mags that I run through my gun, and only one Chip McCormick mag runs completely reliable. I've numbered my mags and found that for some reason the only mag I haven't had trouble with is one of my CM. My Wilson mag doesn't do it often, but it still will do it once in a while, but one of my CM 8rd mags does it almost every two rounds throughout the whole mag. My gun has about 700 rounds through it so I'm past my break in period. I do not believe it is a problem with my grip since it never happens with one of my mags and I am very conscious not to put any fingers near the slide stop. I've been running brass cased Monarch (Academy brand...I work at academy and its the cheapest ammo I can find.) through my 1911. I really am clueless as to what to do and just don't understand it. It just seems odd to me that I would have got 4 bad magazines out of 5 that are considered good quality mags. Thanks for the help.

 

[Woodshark]

The part of the slide stop that is inside the frame of the gun, may be out of spec. You may want to try another brand of slide stop. Try a Wilson bullet proof or even stock Colt. If you don't want to spend the money, better grab a file and some Dykum. Also you may want to try another bullet shape.

 

[Ske1etor]

Okie dokie... if you haven't cleaned your firearm since your last range trip this is an easy one to fix. Look at the point on the inside of the slide stop and see if it has any copper marks on it. If it does, you need to grab a small file and slightly hit that point until the copper marks are gone. This will fix your problem. The problem is that the "Point" on the slide stop is too long and the nose of the passing cartridges are hitting it while moving up in the magazine.

If this still doesn't fix the problem you can also do a quick "detent" job on the slide stop. If you have a dremel, you can take a small cone shaped grinding tool and tap a very small indention into the back of the slide stop where the plunger rests on the slide stop. This will add some resistance against the slide stop jumping up and down under recoil and being touched by the noses of cartridges.

 

[Lurp]

I just disassebled and put the slide stop back in the frame so I could watch as I inserted a mag with 1 round in it and the round does indeed hit the slide stop. I took a couple small files and some 800 grit sand paper and slightly modified the slide stop so that they don't hit anymore. All I need to do now is get it out for a range test! Thanks for the advice guys, I really appreciate it.

 

[Ske1etor]

No problem. That will most likely solve the problem.

 

[makarovnik]

Stronger plunger tube spring?