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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 12-09-2012, 1:45 PM
vf116's Avatar
vf116 vf116 is offline
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Default First day with the AR.

ImageUploadedByTapatalk1355092844.959856.jpg
Shot 20 rounds through my new AR. First round did that one the left. Does anyone know what caused that? One on the right was the worst dent of the other 19 rounds.
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Old 12-09-2012, 3:22 PM
Kheffley Kheffley is offline
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By any chance are you using a magpul 10/20 round pinned mag? If so try a different mag.

I had the same problem with mine when I first shot it. I built it all up myself and figured it was something I put together wrong. I double and triple checked and everything was perfect. Turns out my rifle just doesn't like the 10/20 round magpul mag I originally bought. What was happening for me was the round wasn't feeding out of the mag correctly into the chamber and the bolt carrier would bite onto the top of the case and smash it into the front of the magwell at the end of almost every other cycle.

I've put about 1500 rounds through my rifle, all with 5 other magpul mags and I've yet to see this happen again.

Edit: added pictures

the top of the case that shows the dent similar to yours.
http://imgur.com/rIfVc

the bottom of the case that jams onto the magwell
http://imgur.com/HW9OS

Last edited by Kheffley; 12-09-2012 at 3:32 PM.. Reason: added pictures
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Old 12-10-2012, 8:59 AM
TF_CAM TF_CAM is offline
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Quote:
Originally Posted by Kheffley View Post
By any chance are you using a magpul 10/20 round pinned mag? If so try a different mag.

I had the same problem with mine when I first shot it. I built it all up myself and figured it was something I put together wrong. I double and triple checked and everything was perfect. Turns out my rifle just doesn't like the 10/20 round magpul mag I originally bought. What was happening for me was the round wasn't feeding out of the mag correctly into the chamber and the bolt carrier would bite onto the top of the case and smash it into the front of the magwell at the end of almost every other cycle.

I've put about 1500 rounds through my rifle, all with 5 other magpul mags and I've yet to see this happen again.

Edit: added pictures

the top of the case that shows the dent similar to yours.
http://imgur.com/rIfVc

the bottom of the case that jams onto the magwell
http://imgur.com/HW9OS

Good Advice /\
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  #4  
Old 12-10-2012, 9:02 AM
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DirtyLawyer DirtyLawyer is offline
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Also, make sure to strip and clean before shooting, if you didn't already. I was in a hurry and didn't - paid for it later when it jammed up and dented casings on first outing. Doh!
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