possession of a suppressor is a felony in california. it's virtually impossible to get a permit for one.
Those are Flares for a Pen flare gun. you can get adapters to make "zip guns" CA hates cool shit!
also its not impossible to get a suppressor in CA. you just need to jump through all the hoops and be a dealer.
As a civi it is illegal and im possible to own one with out being a dealer.
Become a 07 FFL and then get your SOT for an extra 500 bucks a year + pay off the gov with tax stamps and you can do demo's and leo sales for suppressors inside CA... shitty but that is one way you can get a can in CA.
Or move out of Komifornia and get all the Form 1 and 4 items you want!!!