OP mentions switching to a SpecOps stock - good choice. Just don't do what I did:
Mossberg 500 with scope on 24" rifled slug barrel from Wally Mart.
Black Hawk SpecOps recoil suppressing stock.
Load Remington Acu-tip slugs.
Got to shooting range after long day driving on road.
Range master say we have 20 minutes left to shoot.
Line up scope on 100 yard target.
Bang! Scope hits me in the face, leaves a nice little
crescent shaped mark on my forehead.
I forgot to extend the adjustable stock.......ouch!
Some folks just gotta learn the hard way, I reckon.