What suppressor & attachment method?
Sounds like it’s under gassed & part of the problem could be the suppressor
The Rattler has an adjustable gas block, 2 settings, 1 for supers and 1 for subs. Have not shot it yet & still making changes
The 10.5” 300 black AR15 runs great on both supers and subs, put the Deadair K on and supers are fine but it does what you describe for subsonic ammo
Have never cleaned a can or thought they got dirty, but I am lazy
I went and got Magpul’s 300 blackout magazines and different magazine rubber bands on Amazon that say 300 blackout & super or subsonic
Sounds like it’s under gassed & part of the problem could be the suppressor
The Rattler has an adjustable gas block, 2 settings, 1 for supers and 1 for subs. Have not shot it yet & still making changes
The 10.5” 300 black AR15 runs great on both supers and subs, put the Deadair K on and supers are fine but it does what you describe for subsonic ammo
Have never cleaned a can or thought they got dirty, but I am lazy
I went and got Magpul’s 300 blackout magazines and different magazine rubber bands on Amazon that say 300 blackout & super or subsonic