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Posted: 10/29/2011 12:09:47 PM EDT
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Parts wear out, obviously you shoot it and use it. Thats why its always good to keep spare parts. I bought a RRA BCG and the Ejector Spring was all mangled inside the bolt. Had to dig it out, replaced it and never had any issues since.
Id get a new bolt and rebuild that one for a spare. |
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Quoted:
Something is very wrong with that extractor. 
I would at least get a new extractor, if not a new bolt for that rifle, I replaced all of it plus the cam pin for $26. Even the cam pin was beat to shit. The bore is very bright and very accurate so I'm assuming this bolt is not original to this gun. |
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The pin is sheared at one end, very nearly sheared through at the other, with the central portion just about as long as the extractor is wide. Apparently, the extractor was subject to an extremely high lateral or fore-aft load, enough to shear the pin. It's a little hard to tell from the photos, but it looks to me like the extractor tried to lift away from the bolt hard enough to deflect the centre portion of the pin outward in the same direction? Following this train of thought, the extractor then lifted far enough that it came into contact with the inside bore of the carrier while the two were in battery, and the gun jammed hard because the friction on the extractor prevented the bolt from rotating to unlock. The shooter then somehow got enough force on the carrier to cam the bolt open, but in the process smeared and scuffed the extractor ( and possibly whatever surface it was in contact with) and extra load on the cam pin damaged it, as well.
The root cause of such a thing would probably be foreign matter jammed underneath the extractor, such as a popped primer or a big piece of a rim. I would study the carrier for damage. That extractor had to rub against something, if it was my gun, I would want to know what. I would also look at the inside of the carrier near the back. If a person had to apply a huge force to withdraw that carrier, they would likely pry or clamp on something there. |
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two things...
I cant think of any way the striations could tear up the extractor that deeply, but not put a single scratch on the bolt. also I cant see a way that the striations can go that far up the bbl end uniformly. the carrier would have no way of contacting the extractor all the way up past the locking lugs(or even the 1/4inch before them). plus, if it wasn't the bolt carrier and it was rubbing on something else the pattern would not be the same. I'm gonna bet your didnt look too close at the bolt befor you shot it the first time. looks like poor tooling marks and a bad spring to me. dont know how someone F'd up the pin tho. ETA- i could see a light kaboom doing the damage to the pin. |
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Quoted:
So I'm going to assume that it did not look like this before you started shooting? I would take a real close look at the inside of the BCG before I proceeded. Good call The extractor was eff'd up before it was installed. The hammer ramp looks rough/odd as well |
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