Author Topic: 1911 Magazine Feed Lip Spread  (Read 216 times)

Grouchy Spike

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1911 Magazine Feed Lip Spread
« on: June 04, 2018, 06:25:29 PM »
Duane Thomas has published an article in the July 2018 issue of Dillon’s Blue Press magazine, describing the cause of the 1911 magazine ‘lips spread’ and the jam that it creates, and proposing a functional limit of the width between the parallel feed lips of the wadcutter design. 

If you’ve had jams because of ‘lips spread’ you will want to read this article. Check it out!
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Col. Cornelius Gilliam

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Re: 1911 Magazine Feed Lip Spread
« Reply #1 on: June 11, 2018, 12:09:21 PM »
Yup, I've encountered the dreaded "double feed" w/ two live rounds, malfunction.

It started occurring with 7-rnd Checkmate magazines with the hybrid feed lips.  These magazines were reliable for a year or two, then the double feeds started.  Traced it back to the feed lips spreading. 

IMHO, the hybrid feed lip design is more susceptible to spreading then the parallel design.

Switched over to Tripp Cobra magazines and have not had a double feed since the change.

Grouchy Spike

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Re: 1911 Magazine Feed Lip Spread
« Reply #2 on: June 11, 2018, 08:58:47 PM »
The Checkmate GI feed lips didn't last very long either.  The wadcutter feed lips should last longest being parallel.  I noticed that the last batch of Ruger magazines that I acquired had wadcutter feed lips.  The Tripps are also wadcutter design with parallel feed lips. 

The new 'railed' feed lip design by CMC, if it lives up to the hype, may be the answer to longevity.
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Goody

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Re: 1911 Magazine Feed Lip Spread
« Reply #3 on: June 13, 2018, 12:50:32 PM »
I have an article in an old pistolsmithing book at home somewhere. It is all about how to modify the magazines, reshaping the lips and gives dimensions on building a die to hammer the lips back into shape over. This was published early 70's IIRC, so before too much aftermarket stuff was available, mostly GI mags.

Boggus Deal

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Re: 1911 Magazine Feed Lip Spread
« Reply #4 on: June 13, 2018, 04:18:35 PM »
Goody, is there anyway I could get a copy of that from you?

Goody

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Re: 1911 Magazine Feed Lip Spread
« Reply #5 on: June 14, 2018, 08:24:13 AM »
I'll dig around and see if I can find it. I'd post here but copyright laws would probably prevent it? Maybe if I gave credit to the book/author?

KingSnake

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Re: 1911 Magazine Feed Lip Spread
« Reply #6 on: June 14, 2018, 06:16:30 PM »
Dillon Blue Press is archived online.
Go to the link below, then page down to 62.
http://dillonhelp.com/bluepress/july2018.pdf


KingSnake

Grouchy Spike

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Re: 1911 Magazine Feed Lip Spread
« Reply #7 on: June 15, 2018, 09:30:21 AM »
Search with Google "repair feed lips 1911 magazines" and several websites will appear with information.

Brownells sells repair tools: 

https://www.brownells.com/guntech/magazine-lip-forming-tools/detail.htm?lid=10302
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Goody

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Re: 1911 Magazine Feed Lip Spread
« Reply #8 on: Today at 08:11:22 AM »
Boggus
I dug around and looked through several dozen old magazines and books. I couldn't find that article, but will continue to look as I go through things.