AAC s A.S.A.P system allows the silencer to function properly with tilting barrel semi-automatic pistols. However, when used on fixed barrels hosts, the A.S.A.P system needs to be disengaged for proper function. The fixed barrel spacer replaces the driving spring to render the A.S.A.P System appropriate for use on fixed barrel hosts. This new and improved fixed barrel spacer is compatible with our EVO-9, ECO-9, all Ti-RANT 9 versions, and Illusion 9 silencers.