I don't know. I'm wondering. When I was at Darrington recently, the boys near me were firing a battery of AR types. They allowed me to scavenge their brass when they were finished. Some of the fired cases were heavily smoked, even back to the head. I wondered why these would be so coked up. Then it occurred to me, one of the lads was firing a rifle with a suppressor. That got me to thinking. Maybe the suppressor didn't allow the bullet to escape down the barrel quite as quickly, so it started to back-feed gas through the chamber until the bullet was clear. We're talking about a very brief period of time. As I understand it, the air in the barrel compresses ahead of the bullet when the cartridge is fired. This causes a bit of resistance. With a suppressor in place, maybe that compressed air cannot escape as quickly. With this scenario, it would suggest raised pressures.
Or: One of their AR's was a short barreled rifle, might this have been the cause of extra-smoked cartridge brass?
Comments?
Or: One of their AR's was a short barreled rifle, might this have been the cause of extra-smoked cartridge brass?
Comments?