Sectioned AR15 Barrel

[dacron]

The gas port erosion is crazy.

It erodes forward (I would have thought it would do it towards the breech), and it's not clear in the photo, but the erosion channel is slightly 'fluted?'.

I was surprised that there's no erosion between the muzzle and the brake, but once it reaches the gills of the brake (and reaches oxygen?), it becomes dramatic

I took a vg6 gamma off a 14.5" ar barrel with ~2000 rounds on it. When I removed it, metal pieces fell off of the brake threads.

The gas had wrecked the inside of the break substantially, withering it away and into weird shapes. But the threads in the brake that didn't get contact with the barrel threads, were stuck to the barrel/brake due to oil, and FALLING out when the brake was removed. You can see gaps in the thread of my muzzle brake now, completely unusable of course as 1/4 of the thread is missing. I only wish I could take better photos so I could show it.

 

[Kevin M.]

Most interesting photos of the week.

~100,000 cycles through anything is a lot when the operating pressure is 55,000PSI. Always interesting to see the physical interaction of the propellant gasses and the steel components inside a gun like this, especially on a gun most people here own, but the majority will never will fire even 10% of that volume of ammo through.