Ar15 feeding problems


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Old 08-18-2013, 03:00 PM   #1
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Default Ar15 feeding problems

I have problems with my DPMS feeding ammo at auto fire with a slide stock.

It usually does pretty well with semi auto but sometimes does not feed a shell and puts a small long narrow dent in the shell that did not feed. Anyway to tell if it is my mag spring getting weak or if the bolt is not picking up the shell and feeding it properly. Any guidance is appreciated.\\
Thanks.



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Old 08-19-2013, 01:36 AM   #2
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Pay close attention when loading your mags, make sure every cartrige is set against the rear wall of the magazine, most importantly double check the the position of the very first round prior to insertion of the mag into the receiver. I had the same problem until I noticed just before loading my magazine the first round was slightly askew. You might think it would be negligible, barely noticeable but that was my problem. Operator error.
I have a half a dozen NATO 62 grain penetrators with a shallow/ narrow dent 3/4 of the length of casing.



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Old 08-19-2013, 04:24 AM   #3
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Its cycling faster than the magazine can keep up. Dpms uses lightened bolt carriers you might need a m16 style bcg and possibly a heavier buffer. Dpms are also generaly over gassed exponentiating the problem. Getting a better bcg and heavier buffer still might not solve it. Dpms just aren't meant to run that fast.

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Old 08-19-2013, 04:36 AM   #4
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In addition to what Jon said, does your DPMS have M4 feed ramps? They're helpful in a carbine that's cycling near full auto rate. Also you speak of magazine, not MAGAZINES. Is this limited to just one?

I'd eventually get rid of the bumper but it may have pointed out problems in your AR.

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Old 08-19-2013, 03:44 PM   #5
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Like they said:

Most Carbines these are factory overgassed to be able to reably shoot softer loaded ammo.
When going full auto you overcycle.

After adding a heavy buffer (maybe even full auto BCG) try to use a brand new quality magazine to ensure a stiff spring.

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Old 08-19-2013, 05:58 PM   #6
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Quote:
Originally Posted by vetteguy View Post
Anyway to tell if it is my mag spring getting weak
Quote:
Originally Posted by Quentin View Post
Also you speak of magazine, not MAGAZINES. Is this limited to just one?.
Before you spend much money, try a new, quality mag.
Inventory is amazing right now.
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Old 08-20-2013, 10:08 AM   #7
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Its cycling faster than the magazine can keep up. Dpms uses lightened bolt carriers you might need a m16 style bcg and possibly a heavier buffer. Dpms are also generaly over gassed exponentiating the problem. Getting a better bcg and heavier buffer still might not solve it. Dpms just aren't meant to run that fast.
Thanks for the info. Disappoint but sounds logical ad likely.

I may try a heavier auto bolt. I do have new mags and they helped some but not a cure.

Guess there are no cheap versions of auto out their.
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Old 08-20-2013, 11:15 AM   #8
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"H" Buffers may also be a cheap improvement

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Old 08-20-2013, 02:13 PM   #9
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Yeah, a heavier buffer is a smart upgrade. If you have a 16" barrel with carbine length gas plus over gassing you might be able to run an H3 buffer without short stroking. Probably should get an H2 though if you run cheap ammo.

Or get the H3 and if it short strokes, knock out the roll pin from both buffers and swap one weight. Now instead of a standard and H3 you'll have one H and one H2!



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