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High round-count MR556/762 reports?

4180 Views 11 Replies 6 Participants Last post by  lifesizepotato
For those who have a lot of rounds through their MR556/762s, how have they been holding up for you, and how many rounds have you put through them?

I'm especially curious about that infamous chromeless barrel, as there's a popular thread on another forum where a guy who runs a high-volume range in Las Vegas said their MR556A1 was keyholing badly by just 10,000 rounds. Since being posted lasted summer I've seen this referenced around the internet as proof that HK's ARs are overpriced garbage, so I'm wondering if other people have been having that issue or if it's a matter of running solvents through the barrel or what. I only have a few thousand rounds through mine but haven't had issues yet, though I admit I don't run it as "hard" as others. I have no desire to stir up the chrome lining debate for the millionth time, it is what it is, but is having the barrel shot out by 10k rounds (as his report implies) to be expected?

And I'll probably never come close to 10k on my 762 but I'd be interested to hear about those as well.

Apologies if this has been discussed somewhere, Googling and HKPro search didn't turn up anything except that Arfcom thread.
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Heat is much more the enemy of barrels than raw round counts. Henderson is a rental range that caters to tourists wanting to fire fully automatic weapons and basically spray at 25 yards or so. Based on their business model, I'm fairly certain "sustained rate of fire" is not a thing at Henderson. I'm very happy for some of the feedback they've been able to give, but it's not any kind of field testing, it's really more glorified, unscientific long term destructive testing. No one, for example, feels that an M4A1 can only last ~900 rounds, but under the right circumstances...

Given what they do there, it's not surprising that they burned out an unlined match barrel quite quickly, it's not what the barrel was designed for. Lots of full auto means a lot of heat in a short time, and that will wreck a barrel posthaste--10,000 rounds like that is not the same thing as 10,000 rounds of slow-fire, or even rapid fire.

Unless you too are looking for a full auto rental gun that you can bill as "the gun that killed Bin Laden" to hand to foreign tourists who may never get to actually see or touch a gun in their lives but have been brought up on American movies, I would expect your barrel to last quite a bit longer than Henderson's did.

~Augee
 
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