Broad River Tactical AR-15 SD vs HK MP5 SD

[@broadrivertactical]

The HK is quieter but my barrels do bring velocities down to subsonic speeds. The HK is roller delayed as opposed to the radial delay. The bolt may stay closed a little longer on the HK but not positive.

[@heineken42069]

Thanks for the comment man! Love all your products!!!

[@juanthelawnmowerthief1641]

Which SD was quieter? Is this the radial delayed version?