A few months back I saw a flash hider for the Ruger PC4 carbine....but cannot remember the link, or the web site. It was surely aftermarket.
Anyone know where to find such an animal....brownells and midway are no go.
You sure you're not thinking of the Mini? FWIW, if you use lower-flash ammo, you should get relatively minimal flash (with low flash pistol ammo) out of the much longer carbine barrel.