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Magazines will not lock up in AR 15


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Old 06-05-2016, 07:44 PM   #1
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Default Magazines will not lock up in AR 15

I just finished building a new AR 15 using Anderson and Spikes parts kit - took it to the range today and discovered that plastic/polymer magazines will not lock into the magazine well - However, aluminum magazines do - I tried polymer magazines from Tapco, Troy and P-Mags and did not effect it - I even tried dremeling the magazine catch recess on the magazines to see if that was the problem - still no effect.

However, aluminum magazines from Blackhawk, USGI, and Red Jacket work fine - no problems locking solidly in the well.

I tried backing out the magazine catch/release button to see if that would help - it did not

Suggestions?


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Old 06-05-2016, 08:14 PM   #2
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Will the polymer magazines seat in the mag well when unloaded?

Edit: Is the bolt forward or locked back when you're trying to seat the magazine?


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Old 06-05-2016, 08:24 PM   #3
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Default No

I tried both ways - bolt open - bolt closed will not lock

aluminum magazines work no matter what way I try them
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Old 06-05-2016, 08:37 PM   #4
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It could be an improperly machined magazine well (magazine catch hole machined slightly off center from where it should have been) or an improperly machined magazine catch (more probable).

I usually blame the magazines, but I doubt that three different polymer magazine manufacturers all happened to produce out-of-spec magazines that you just happened to get your hands on.

What's the make and model of your rifle? Or was it assembled from a parts kit? Are you the original owner?
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Old 06-05-2016, 09:12 PM   #5
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Default Parts gun

Anderson stripped lower, Anderson M4 Upper - Spikes lower parts kit - I just assembled it a couple days ago - took it to the range today - shoots great (well as well as my 50 yr old eyes can through a peep sight) upper was military zero I am sure because after shooting it - I saw it was printing like others I had built or were rack guns - took my military adjustments 8 clicks down, 2 left and it came right in.

5th build I have done with no problems before like this - and as I said aluminum mags lock in fine
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Old 06-05-2016, 11:14 PM   #6
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I'm not sure what to tell you. This sounds like a magazine catch or magazine well dimensioning / machining problem to me. That's not likely to be a simple and easy problem to fix. That rifle is probably going to be an aluminum USGI mag-only rifle.
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Old 06-06-2016, 12:45 AM   #7
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Internet is your friend

Search on the brand you have and see if there are any reported problems. I recently took an AR class and struggled all class, until I tried a different brand I happened to bring. NO issues! Came home, searchd on the brand, and six magazines are now in the land fill.
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Old 06-06-2016, 03:00 AM   #8
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Have you tried screwing the mag catch in where it would pull farther into the mag well. Also if you remove the upper and insert a mag in the lower you can have a better view of what is going on from above.


Sent from a phone I can use to do my taxes, but can't make a damn call.
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Old 06-06-2016, 04:59 AM   #9
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Default Done that too

Yes, I did both - still no effect.
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Old 06-06-2016, 12:19 PM   #10
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May have had too much material removed during remanufacturing process of the lower. Polymer mags will usually work when it's too tight for USGI mags.


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