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Posted: 5/17/2007 9:41:15 AM EDT
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Guy came in the shop the other day and said his rifle was having issues with failures to feed. I opened the gun up and something fell out. I looked on the floor and saw that it was the head to a allen screw. The head of the screw had broken off the body. At first I thought it didnt seem like a screw that goes on an AR anywhere. He had an M900 attached to an add on GG&G rail, the type of rail that just screws on to the handguard. Looked at that rail and the screws were all present and secure... A second later, I realized he said he was having problems with feeding, which could be gas. I looked at the bolt carrier and saw that the head of the screw had sheered off one of the gas carrier key screws. Yup... that would do it. Ive seen loose screws that had been improperly staked, or not staked at all. But I havent seen a screw break like this. sorry pic is blurry: |
This is generally my feeling on the issue. When it happens all the time, I change from that attitude to a something is wrong attitude. But I've never seen this before and this was off a city f/a gun that gets used quite a bit. Just thought it was interesting and like to document these things, if for no one else than myself. |
| It seems like that DPMS carrier is working well for you, however, my experience with DPMS stuff has left me with the above mentioned "something is wrong" attitude. People bring broken things in here all the time, and some names pop up all the time. DPMS is certainly among those names. |
| It just happened to me with a low count COLT bolt carrier also. I started haveing short stroking .It turned out to be a shear carrier gas key bolt. Broke clean just like the one shown.But the stakeing held it in the key. It fooled me for a good while till I figured it out. .It does happen!!! WarDawg |
+1 Especially w/their bolts and carriers. But I do agree that it can happen w/almost any brand. It's just that it seems to happen more often w/DPMS |
Over torquing may have cracked the screw. That stake may have been done correctly, but that might have been all that really held the screw in place. new-arguy, did it appear to be staked? What does the remaining one look like? |
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