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Posted: 1/17/2011 5:48:20 PM EDT
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Does anyone run one?
I just put 300 rounds through an MSAR with a silencer and it started getting chronic (every 5 rounds) FT Extract. I took the bolt apart and found a ton of carbon in between the extractor and bolt body in the same space the extractor spring and that o-ring are. Is this common? Is this the cause of the FTE's? Do I really have a piston driven gun that only goes 300 rounds before becoming a club? |
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Don't know what to tell you. I can shoot my MSAR E4 all day long suppressed without any FTE's. In fact I have over 1,000 rounds suppressed through it and have never had any malfs at all. Mine does run just a little dirtier suppressed but not much. It definitely runs cleaner then any of my ARs suppressed and even cleaner then my piston operated XCR suppressed. MadDog 
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Quoted:
Keep in mind that most of the additional carbon buildup from shooting with a suppressor is blowback through the chamber... I notice a great deal more carbon on my E4 when I shoot it suppressed. Same here with my STG. I shoot it suppressed most of the time and never had any failure. |
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Quoted:
Not sure on gas setting. I think full open? Has anyone ever looked at the area under the extractor to see how much carbon build up? I run it on the standard setting. Sometimes I will turn off the gas to get a pretty quiet single shot. I don't get alot of build up under the extractor. No more than I would have thought at least. My mags also get pretty dirty like the above poster stated. I take them apart and stick them and the stock in the dishwasher. Works pretty good! I got that idea from Dave R. Posted Via AR15.Com Mobile |
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Quoted:
Not sure on gas setting. I think full open? Has anyone ever looked at the area under the extractor to see how much carbon build up? It sounds like you might need to turn your gas setting down to "S". First thing that comes to mind about all that gunk getting under the extractor that quickly is that the bolt is unlocking too soon. |
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I've noticed that a substantial amount of brass shavings accumulate underneath my extractor and around the trunion. Hasn't caused any extraction issues yet, but I rarely fire more than a hundred rounds before cleaning. This is without a can... This has got me to wondering if shooting it with a can will make it much worse. Won't know until Miss Snook gets around to my Form 4 sometime this century. On a very slightly related note–– The Gemtech Quickmount that I purchased (metric thread) screws onto the muzzle *very* sloppily. So much so that I have considerable doubt that it will remain concentric with the bore over the long haul. There seems to be very little thread contact. Am seriously considering using high-temp silver solder to fix it in place. That is, I'll think about doing that after I figure out how to make it concentric to begin with; an alignment gauge shows that it is several degrees off. A sure baffle strike on the very first shot  |
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