Silencer adapators available in either polished brass or polished aluminium, suitable for most popular barrel diameters. 

Threaded for 1/2 inch unf x 20 and are 60mm in length (including thread) and slip on 40mm. They are secured via x2 m4 grub screws.

Sizes Are:  10mm (Air Arms S400/S410) 

                11.05mm (Crosman 2240/50)

                14mm

                14.5mm (SMK XS501)

                15mm (Air Arms S200 mk3 and SMK QB78)

                15.5mm (BSA)

                16mm