How long can direct impingement run?
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Old 10-02-2013, 08:32 AM   #1
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Default How long can direct impingement run?

How many rounds can a direct impingement system on an AR-15 fire before the gun starts to mal function in any way, typically?

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Old 10-02-2013, 09:03 AM   #2
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I've never personally ran a test but I heard here on this forum that the military recently ran over 10,000 rounds through an m4 with no cleaning what so ever and no malfunctions. Finally had a failure to feed

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Old 10-02-2013, 10:58 AM   #3
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In the lucky gunner lab/steel ammo test, 4 identical Bushmaster MOE carbines were each fired with 10,000 rounds of ammo. The carbine fired with Federal American Eagle fired all 10,000 without a single malfunction. The Bushmasters got the BCG wiped down with a paper towel at 2,500 and 7,500 rounds, with a detailed cleaning at 5,000 rounds. The other 3 carbines fired with Wolf, Brown Bear and Tula steel case ammo didn't do near as well, with quite a few failures and cases stuck in the chamber.

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Old 10-02-2013, 12:47 PM   #4
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Google BCM filthy 14. A training company ran the gun in classes and didn't do any full cleaning, but only added lube. They documented the process, and any failures pretty well. But it was still going at over 40,000 rounds.

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Old 10-02-2013, 12:51 PM   #5
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Quote:
Originally Posted by CJx View Post
How many rounds can a direct impingement system on an AR-15 fire before the gun starts to mal function in any way, typically?
There are some videos of colt doing a torture test on a full auto m4 running mags as fast as the could change them. Somewhere around magazine 35 the gas tube pops and the gun continues to run in single shot mode. Ak47 catch fire after a dozen or so mags.

Bushmaster typically doesn't use chromed bores chambers on the low end guns which is what was in that test. Those are closer to things like ruger american rifles. They look like ar15 but really aren't.

The bcm carbine filthy 14 primarily ran steel cased stuff with no issues.
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Old 10-02-2013, 01:44 PM   #6
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You're typically going to run out of ammunition long before you have issues with a properly lubricated (with a high temperature bearing grease) quality AR-15 and quality magazines.

Colt, BCM, DD and others all make guns that will reliably feed and cycle steel cased ammo. The polymer coating on Wolf cases can be problematic if you stop firing and leave a cartridge in the chamber, as the polymer will inevitably melt and glue the casing into the chamber. Apart from that, the zinc and brass plated casings (Silver Bear and Golden Bear, respectively) won't have that problem.

I've shot a variety of American ammo in communist guns (Arsenal, NORINCO, and PolyTech) and communist ammo in a Colt AR-15 with no ill effects. YMMV.

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Old 10-02-2013, 04:53 PM   #7
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How many rounds can a direct impingement system on an AR-15 fire before the gun starts to mal function in any way, typically?
They will run as long as they do on COD. All the gun needs is Lube
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Old 10-02-2013, 05:01 PM   #8
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IMO, there isn't any definate number due to different variables. ammo being one of the most important. different powders burn either cleaner or dirtier than others.

but it begs the question, why would a person want to? what is wrong with proper cleaning and maintenance? just because you can, doesn't mean you should.

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Old 10-02-2013, 05:33 PM   #9
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The more relevant question is how much ammo do you have? Do you have access to enough that this sort of issue could come into play?

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Old 10-02-2013, 06:12 PM   #10
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I don't think any of us here can afford enough ammo to choke up any rifle that is properly built.

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