The original Revolution® 9 & 45 suppressors were the first pistol silencers developed and brought to market with a modular length feature set, and that Griffin innovation inspired all the other modular length pistol suppressors in the US marketplace.  The (MOD 4) Revolution® 9 suppressor represents a total redesign around of package of end user feature interaction enhancements, making the suppressor more secure and easier to mount, as well as fast and easy to configure in length, and easy to disassemble, at vastly increased maintenance intervals. The forward extension allows tool-less reconfiguration, and the O-ring biased extension and front cap prevent inadvertent loosening of the extension or cap. The booster housing (mount accessory interface socket) is permanently installed so tightening and loosening the suppressor does not result in loosening of the booster housing. The housing accepts pistons, fixed barrel mounts and spacers, our Griffin developed industry first integrated 3 lug mount, as well as Plan A mounts.