Description Fits barrel thickness from 14.5mm to 16mm (can also make thicker or thinner on request). Also works very well with air rifles. The silencer comes with 3 spacers – thin, medium, and thick. Replacement spacers can be ordered here. Uses plastic spacers to accommodate different barrel sizes (thickness). A plastic spacer also protects the barrel so that the grub screws do not make marks on the bottom of the barrel. No thread is needed. Has a slot to accommodate the front sight but recommended to only use when shooting with a scope. Reduces sound with 40%! (Normal silencers are between 35% and 45%, meaning this one is spot on) 155mm long 40mm diameter Weighs 80g
