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I think ... you need a bigger gun case. ?

The 18.3 is the metric diameter of the bore, 18.3 mm = 12 gauge. PSF =Polvere Senza Fumo = Italian for smokeless powder gun proof mark.

theyre HORRIBLE design!!!! 1. they promote dirt to fly into the piston system 2. their attachment is nutty and junk (read the instructions on attaching them!) 3. theyll chew your fingers up 4. make you wanna hang yourself taking them off and on to clean the gun more than once!!!