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It would have been interesting to see how poor it had become. Unfortunately we didn’t test the accuracy of this barrel before taking the gun apart. Since this jump to the lands of the rifling should start at around 0.100” (it can vary somewhat due to chamber spec) the throat was approximately 6 times longer than it should have been. When measured next to a new barrel, the throat on this barrel had eroded nearly.
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This increases the distance the bullet must travel after leaving the brass case before it contacts the lands of the rifling. If you aren’t familiar with the term, throat erosion is just the throat of the chamber eroding down the barrel. The most interesting thing we found was the throat erosion on the barrel itself. This was likely a contributing factor for many of our cycling issues and made sense given what we noticed while shooting it. Not horribly, but it was over spec for a carbine length gas system. We did find that the gas port itself was eroding. It turns out, that concern was unfounded. We have seen aluminum gas blocks erode terribly and with the round count on this particular gun we expected it to be in rough condition. This was surprising given that the gas block was an aluminum block from Anderson Manufacturing. Once apart we found that the gas block, and gas tube, were both in very good condition. The recoil impulse was off and it was ejecting brass at a short forward angle hard enough that it was actually chewing into the upper receiver a bit at the forward edge of the ejection port. I took the gun out and shot it and it ran fine for me, but I noticed that it was cycling hard. We would clean it thoroughly and find that it would run again, only to go down after a few rental sessions. It was experiencing failures to extract, to eject, and to feed. Over the last few weeks, however, we have noticed that the rifle regularly gets taken down for service. We decided to swap the entire bolt carrier group with one from Ballistics Advantage (made by Aero Precision) and it has been running with that bolt carrier group since.Īside from needing to be cleaned regularly, and needing new gas rings periodically, the gun requires very little maintenance. It broke at the cam pin, a common point of failure for these guns. That is a substantial amount of ammunition through a rifle by anyone’s standards.Īt around 80,000 to 90,000 rounds we had a bolt break. Based on the number of times it is rented, and the average number of rounds fired through it, the round count on this rifle is estimated to be between 100,000 and 120,000 rounds. 223/5.56 and it is rented and shot every single week multiple times. We topped it off with a set of Magpul MBUS sights and we put it back into service.įor the last three years this rifle has been our primary rental rifle chambered in.
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We swapped the fixed stock for an Anderson M4 adjustable stock and the handguard was a custom one made for us with our logo by Unique ARs. The barrel used was a 16” used DPMS chrome lined 1:9 twist M4 profile barrel I took off one of my personal rifles several years before. We replaced the upper with an Anderson Manufacturing Sport upper. It seemed nobody wanted to shoot a fixed carry handle, 20″, fixed stock rifle so we converted it to a 16″ with an adjustable stock.
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Since this gun had been at the store long before I got here I don’t know exactly what brand those parts were but the lower receiver was an Essential Arms and it was a 20” A2 fixed carry handle rifle. The only parts it retained were the bolt carrier, the lower receiver, and the small parts typically included with a lower parts kit (trigger, hammer, detents, springs, etc). After that rebuild it was practically a new gun. We have a rental AR that was rebuilt in 2014.