Thanks guys, I'll tear apart the gas system this week and give it a thorough cleaning/inspection.
How long do the BCG parts usually last before needing replacement? I'll probably replace the springs while I'm at it since it's a cheap/easy fix, but if this is something that needs to be done regularly I might buy a bunch just to have on hand.
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How long do the BCG parts usually last before needing replacement? I'll probably replace the springs while I'm at it since it's a cheap/easy fix, but if this is something that needs to be done regularly I might buy a bunch just to have on hand.
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I think you would be best served by starting with the simplest possible remedy and test after each change. Otherwise you could end up chasing your tail looking for the problem. You could change the BCG out for a known good item and eliminate most of the issues mentioned in one go, but I would do it piece by piece starting with the ejector. One thing you may try if you dont want to remove the ejector, since it can be a pain without the right tool, is just swap out the bolt with a known good bolt and put your old extractor and spring in the new bolt.
The bolt springs, extractor and gas rings should be changed out at around 5000 to 7500 rounds for a carbine length gun with that length of barrel.
You can measure the length of the buffer spring and determine if it is needing replacement. Replace if it is shorter than 10 1/4 to 10 1/8 inch long. New they should be 10 3/4 to 11 inches long.
I am looking at it like an intermittent problem and basing that on him not using the same magazine every time he has the failure. I am guessing that he rotates several mags and the possibility that the same magazine was the first to be used at each session of shooting is slim. Also, I think there is a possibility that the ejector channel is gunked up which clears itself after a few rounds down the tube.
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Not exactly familiar with the ar system yet but as it happens was reading something today and a lot of people are going to the gas system but not specifically the gas rings so going to throw that out there. Easy free way to test as well, http://thearmsguide.com/6857/ar-15-maintenance-need-new-gas-rings/
Since it only happens with the first mag I'd start by looking really closely at your lube regimen - either for somewhere that's got a bit too much lube that gets burned off/blown out while shooting, or alternatively for somewhere that needs a bit more lube and accumulates some during operation. If you don't usually lube your buffer spring that may be a good place to start.
.....or get an AK.
And there it is. Made it almost two pages before the 'AK is superior' innuendo.
fantastic
fantastic
Already have one. Thanks for the input though!
Super helpful. But what if he wants to shoot accurately past 100 yards?
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