[ARCHIVED THREAD] - Double feed

Posted: 1/6/2009 8:46:21 AM EDT

What is the most common reason for this? Is it purely an extractor issue or could it be mag related? I've had two so far out of about 200 rounds. Is this normal? Is 1 out of every 100 rounds fairly common or not? Thanks.

Posted: 1/6/2009 9:19:38 AM EDT

[#1]

Double feed of two live rounds is usually mag-related. Jam caused by one empty and one live round is usually indicative of dropped extraction (need to increase extractor tension, sometimes use heavier buffer).

Sam

Posted: 1/6/2009 10:31:22 AM EDT

[#2]

true double feeds are a magagazine induced malfunction.

Posted: 1/6/2009 11:48:01 AM EDT

[#3]

Yes it was two live rounds. Thats what I found peculiar. How does that happen then exactly? Is the spring tension too great from the mag?

Posted: 1/6/2009 11:59:03 AM EDT

[#4]

Quoted:
Yes it was two live rounds. Thats what I found peculiar. How does that happen then exactly? Is the spring tension too great from the mag?

Improper feed lip geometry.

Posted: 1/6/2009 5:16:44 PM EDT

[#5]

When material in the feed lip area gets fatigued this happens. Sometimes you can see lateral bulging when the mag is fully loaded. It can be so pronounced that you can feel resistance seating the mag in the magwell.

A simple test involves dropping the loaded mag on a table from just 6" or so. Rounds will often just pop out of tired mags.

One double feed out of 200 rds is more than I would tolerate unless I wanted to designate it for range use only. Given the price of mags today (well, maybe not in 6 months) I would replace suspect mags with new.

Sam

[ARCHIVED THREAD] - Double feed

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[ARCHIVED THREAD] - Double feed

[ARCHIVED THREAD] - Double feed