Cycling issues on suppressed .300 AAC Blackout with subsonic ammo

[bigwojman]

Morning and belated Happy Thanksgiving! I have a new Diamondback DB15 FDE .300 AAC Blackout that I have a Q Thunder Chicken QD suppressor on and am having issues with the firearm cycling Hornady 208 gr A-MAX subsonic ammunition.

The issue seems to be sporadic but persistent. Firearm will cycle fine and then will hang-up and only partially load a cartridge into chamber. Have tried different magazines without success.

Appreciate any insights that the members can offer!

 

[reddog]

since it's stripping a round out of the mag I'd say it's not undergassed. I'm thinking it's the ammo.

 

[MTA]

Does it work without the suppressor?

 

[Johnny Diamond]

Sunk primers? Or worn firing pin?

Sent from my SM-G973U using Tapatalk

 

[CavCop]

What kind of magazines are you using?

 

[jjkukla]

Does it work without the suppressor?

This.
Also, does it work WITH supersonic and suppressor?
Is ammo hand load or factory? Sorry, don't know much about Hornady offerings.
Just trying to consider all scenarios.