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Posted: 6/8/2014 6:09:54 PM EDT
| I just built an AR and the first 25rds shot were flawless. Then I had issues with rounds not being fed. After every round, it would eject, but the next round wouldn't chamber. Tried multiple mags, still continued to do the same thing. What are your opinions? I'm thinking it may be an issue with the buffer/spring, or maybe a lubrication issue. Thanks in advance. |
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Yup, short stroking. Gas block is tight?? If set screw re check it. In the case of my BCM 20" it did exactly the same thing. But I was running wolf gold and AE223. With 556 it was fine. I drilled out the gas hole two sizes and it runs like a champ on anything now.
If there are no gas leaks and you don't want go drill you can run a Wolff springs reduced power recoil spring. I'm running one on my SPR so it will run cheap ammo and always lock the bolt back ( wouldn't until I did this... At least not consistently .. ). Definitely worth the $15 did the trick Also make sure the gas tube isn't slightly angled putting excess pressure on the BCG as this can also slow the BCG down and make it short stroke |
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Gas system seems to be in check. Not loose at all. Any idea on gas hole size? What brand barrel? My spikes carbine barrel I used was only a .062 and I had to open it up to .070 to make it run cheaper ammo ( always ran it but wouldn't lock the BCG back.. ) Strangely enough the only barrel I've left alone is my 14.5" middy BCM, eats shit for breakfast and loves it. |
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Basic buffer, Spikes BCG. What ammo are you using? I'd pick up a box of 556 and see how it runs. If it runs fine on 556 but chokes on cheaper plinking ammo and your sure there are no gas leaks you may have to try the reduced power recoil spring or open up the gas port. Or shoot more expensive ammo |
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Its a gas problem, did you put the gas block on correctly? like leave a space for the front handguard cap. take a mag w/ 1 round only, shoot it, does the mag catch engage, if not, its a gas problem. Since its happened after heating up, all my money is on the gas block or a bad gas key on the bcg, there really is no where else it can "leak" |
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Its a gas problem, did you put the gas block on correctly? like leave a space for the front handguard cap. take a mag w/ 1 round only, shoot it, does the mag catch engage, if not, its a gas problem. Since its happened after heating up, all my money is on the gas block or a bad gas key on the bcg, there really is no where else it can "leak" This. Check for loose gas key, and did you leave the space between block and shoulder where a HG cap would be? 0.032" IIRC. If you know anyone with a borescope you can look "up" the gas hole from inside and verify alignment. HTH |
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Gas system seems to be in check. Not loose at all. What frustrates me is that it ran fine. Sighted in the scope and fired multiple rounds rapid fire. Then it just started acting up. My guess is a lubrication issue. ARs are engineered to run wet. If you are running it dry, you will have issues. |
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Gas block was on tight. It was the first thing I checked. It is a carbine buffer tube. Not sure what kind of spring it is, I bought it off of ebay a while back. It may be a while before I can really check your theories. I'm leaving for vacation this weekend. I wouldn't trust anything from ebay but that's me. Just because the GB is tight does not mean it is lined up correctly. Like I said earlier, remove the GB and makes sure the carbon buildup mark is over the gas port of your barrel. |
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My guess is a lubrication issue. ARs are engineered to run wet. If you are running it dry, you will have issues. Quoted:
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Gas system seems to be in check. Not loose at all. What frustrates me is that it ran fine. Sighted in the scope and fired multiple rounds rapid fire. Then it just started acting up. My guess is a lubrication issue. ARs are engineered to run wet. If you are running it dry, you will have issues. THIS.... Especially on a new AR it needs to be wet till broken in.... Hell it always needs to be wet as far as I'm concerned. As easy as a remedy this is to check I'd start here before over thinking things.... |
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While there are many possibilities in my experience most of the time on a new build’s first time out it is lack of or improper lubrication.
Even with a generous lube job mine (new builds) generally want more lube around 60 rounds and will then run out past 200. Bad mags run a distant second followed by other issues. |
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With a 14.5” barrel gas ring alignment is not likely to be a problem. Given the number of people on the board who do think it is a myth it would be humorous if it was the problem. I know, I just figured it would be worth looking at in case it was something more than an alignment issue with the rings. Maybe one or more are damaged, who knows. Yes, I know some people have ran a rifle with even only one ring too... |
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