I've just purchased my 1st pistol caliber AR, a circle 10 lower for glock magazines with an unknown upper with an approximate 10" 9mm barrel with an unknown keymod free float hand guard. The flash hider is a YMH, model ymh-80-52c I believe for 9mm. After researching and following the threads, I decided I needed a flash can. I got one from a member here on EE. It appears to be threaded on the inside rear portion. When I slipped over the flash hider, it was obvious something is missing as it just rattled around.
Besides mitigating the noise and flash for my wife and kids, my first suppressor will be on it at a later date. I'm also using a Fab Defense grip that houses a Surefire poly light. Right now, even with a cap over light, it sits directly below the flash hider. I'd like to avoid damaging it from concussion and muzzle flash.
Your thoughts would be greatly appreciated.