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  1. Is it short stroking? Or is the bolt not moving at all? Hard to tell. But to run a heavy ass 300aac on a pistol length you need to Drill the gas port add an adjustable gas block on it for more gas, then a springco yellow reduced power buffer spring in it and lightweight carbine buffer. To get It to cycle. The spring is the main issue to much tension. If it doesn’t cycle still Try slightly more powerful subs..

  2. I have the same firearm. What type of suppressor is this? And also what would be the purpose of both of these particular styles of bullets? If I just put some 55 grain down range with that silencer, but it still sound the same?

  3. Remember the first 3 shots fired at Trump were real quiet like the subsonic shots and the last 5 were real loud because they were supersonic but without a suppressor. Two different rifles two different shooter's.

  4. Making an AR-15 cycle reliably with subsonic rounds—particularly in .300 Blackout—requires reducing the operating mass and maximizing the available gas pressure, as subsonic ammo produces less energy to cycle the bolt carrier group (BCG). The most effective combination includes using a suppressor, a pistol-length gas system, a lighter buffer, and a lighter buffer spring.

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