Will it shoot fine with supers and no can?

Will it shoot fine with subs and no can?

Does it shoot a couple rounds then "click" with the can attached?

Running a H2 buffer?

What gas block?

We need more info...

The "light primer strike" is when you chamber a round and the floating pin design of a AR actually hits the primer when the bolt is closed. This is normal.

Unburnt power in the lower is because of running suppressed and sometimes low quality powder.

Do not take this the wrong way but PSA is known to have out of spec parts so this could become a wild goose chase...

Getting a 300 to run on a 8.5" suppressed with subs reliably isn't as easy as everyone thinks.