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Old 12-25-2011, 07:52 AM   #1
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1911 push feed

I know that there are more than one reason for a push feed on a 1911, but this being the Pistol smith web site I thought that I could get all the reasons for the push feed from the experts. Thank you in advance for your years of experiance.

Cuba
 
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Old 12-25-2011, 07:59 AM   #2
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I'm not an expert. Just wanna welcome you to the forum, cuba.....
 
Old 12-25-2011, 12:34 PM   #3
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Welcome. Fate has brought you to the light. Fate, it seems, is not without a sense of irony.

Kidding. I'm not a pro, but can you clarify a little more what you mean, "I could get all the reasons for the push feed from the experts".

It's for function. At least that's the best answer as far as what I THINK you're asking. It seems too obvious though, so I have the feeling it's not what you meant.
 
Old 12-25-2011, 03:11 PM   #4
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Cuba, the M1911 is a "Controlled Feed" design. That means that the round is captured by the extractor even before the cartridge completely leaves the magazine. An M1911 should feed properly when held upside down, because the extractor and breech face "control" the round through the entire chambering cycle.

"Push Feed," on the other hand, refers to the design concept where the extractor "pushes" the cartridge into the chamber. The extractor does not engage the case rim until the cartridge is fully chambered, and the breech face can force the extractor to pop over the rim.

An M1911 that "push feeds" is defective. One cause is the magazine, which for several reasons releases the cartridge before the cartridge rim slides under the extractor hook. Of course, the most common reason is inserting a cartridge into the chamber, then allowing the slide to go forward.

I'm not entirely certain what your question is; thus, I've given the basic principles involved so that we can start from the same point of understanding.

Regards,

Walt
 
Old 12-28-2011, 08:52 PM   #5
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Quote:
Originally Posted by cuba View Post
I know that there are more than one reason for a push feed on a 1911, but this being the Pistol smith web site I thought that I could get all the reasons for the push feed from the experts. Thank you in advance for your years of experiance.

Cuba
I know of only one reason, and that's a faulty magazine.
 
Old 02-04-2012, 05:21 AM   #6
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How would I know if my 1911 push feeds or control feeds? Is there a function check anybody here could teach me?
 
Old 02-04-2012, 08:27 AM   #7
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Quote:
Originally Posted by bingd View Post
How would I know if my 1911 push feeds or control feeds? Is there a function check anybody here could teach me?
Just watch as you load a cartridge from the magazine. If the rim slides up and under the extractor hook, the cartridge is being controlled.

If the cartridge is pushed into the chamber by the extractor, which then has to be forced over the rim into the extractor hook when the cartridge is fully chambered, the pistol is push feeding.

Regards,

Walt
 
Old 02-04-2012, 02:46 PM   #8
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It's most often caused by a weak magazine spring, and...as so often occurs...it happens on the last round because of a weak spring and the lack of a speed bump on the follower...or both. An overly-heavy recoil spring can make it more likely to happen, but is only rarely the cause.

What happens is that the cartridge "jumps" the magazine when the slide impacts the frame...obeying Newton 1A: "Objects at rest tend to remain at rest." Another symptom that often shows up at the same time is the slide locked back with the last round loose in the port.

Another indicator of a weak mag spring is the "Bolt Over Base" misfeed.
Essentially a live round stovepipe where the cartridge is standing straight up, caught between the slide and the barrel hood.

Another interesting little trick that it'll do is eject the next-to-last round and chamber the last one. If you find live rounds amongst your fired brass...Heeeere's yer sign.

To determine if you have that problem...examine the fired case rims closely. If you notice a burr on the edge of any of the rims that look like the brass has been smeared, it's push-feeding. In most instances, it'll only be one or two rounds per magazine...but that's enough to cause extractor problems over the course of a couple thousand rounds.

Last edited by JohnnyT; 02-04-2012 at 02:54 PM.
 
Old 02-04-2012, 05:10 PM   #9
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1911 Forensic Evidence-101 by Professor JohnnyT. It don't get much better.........
 
Old 02-05-2012, 06:54 AM   #10
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Thanks for the replies. I took out my recoil spring and guide rod; inserted a magazine with two rounds in it, engage the gun into half-battery and found out that the extractor is holding the bullet.

It's a control feed....
 
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