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Posted: 9/5/2013 8:56:05 AM EDT
| Yesterday I went shooting and about every 3rd shot my gun would eject the spent casing but wouldn't grab a hold of the new one to feed into the chamber. What's going on? |
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Can you give us a little more information as to the brand of rifle, configuration, magazines used, types of ammunition, new or used rifle and a rough idea of round count, etc?
CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
| It's a DPMS mini SASS with aprox 500-600 rounds down the tube. It did it with both brand new magpul & promag PMAGS. When it does fail to grab the new shell I have noticed that the bolt is leaving a nice scratch down the side of the top shell in the mag. I was wondering if I maybe put a lighter weight buffer in it that it would allow the BCG to slide further back to grab that shell? And it does it with both factory ammo and with reloads. |
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Go through Chapter 2 of TM 9-1005-319-23&P which deals with troubleshooting.
http://www.kdeguns.com/ar-manual/M4%2016%2023Pchange8.pdf |
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Don't change anything yet-
What ammo are you using specifically? Load one round in the mags, load, and shoot it. Does the bolt lock back on the empty mag? Try it a couple times with the same ammo for repeatability. If it does not lock back on empty you have a couple possible issues - either weak ammo, gas line blockage or leak, too heavy of a buffer, or too heavy of a buffer spring. |
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From the sticky at the top of the page...(and to expand on what the previous poster said)
"––-TEST FIRING PROCEDURE––- -Unload the rifle and verify that it is clear. -Check the bore for obstructions. -Load the rifle with one round from the magazine. Use quality ammunition and a proven magazine for this. -Aim downrange and fire, the bolt should catch on the bolt stop. Hold the rifle as loosely as possible. -Reload and repeat the process if the rifle does not lock open. Depress the bottom of the bolt stop before firing this time. This allows for weak magazine springs, sticky followers, or an overly strong bolt catch spring. -If the bolt does not lock open then there is a gas system problem. Investigate and repair the problem. -If it only locks open with the bolt stop depressed, repeat the process with a different magazine. If the rifle still fails to function then look at the bolt stop as a probable culprit." |
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