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 45 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.Another major improvement introduced in the MOD 4 generation is the incorporation of Griffin's patented CARBON-GARD baffle technology. This concept, originally debuted in the Checkmate HD suppressor, has applications for pistol suppressors to make cleaning and maintenance of the suppressor easier even after very high round counts. High temp silicon o-rings are positioned at each baffle interface as well as the end cap, blast chamber, and extension tubes to fully seal gases and carbon within the baffle stack. This gas seal prevents lead and carbon fouling from building up between the tube body and the baffle stack, eliminating instances of the baffle core being carbon locked inside of the tube body, a condition that is very annoying for the end user.Revolution MOD 4 Suppressors ship with an included EZ-LOK piston providing a more secure, and rapid mounting system than direct thread. EZ-LOK barrel end adapters are available for purchase separately. (Note: to use the EZ-LOK piston included with your silencer, you will need to purchase an EZ-LOK barrel adapter to install on your host firearm. You can purchase one with the silencer using the buttons above during the add to cart process) We highly recommend utilizing the EZ-LOK system to mitigate chances of baffle strikes or catastrophic failure due to the can inadvertently coming loose. Best practice is to check your pistol suppressor for tightness every 1-3, 15 round magazines due to the excessive vibration inherent to tilt-barrel handguns. In the event the end user desires to use a legacy direct thread piston (available separately), the best practice is to check tighten the suppressor every 2-3 rounds fired. It goes without saying that a 15 fold or greater enhancement in mounting security is a phenomenal improvement to pistol suppressors.FEATURES17-4 H900 Heat Treated Stainless Steel Baffles7075-T6 Aluminum tube body/end cap constructionModular LengthTool-less DisassemblyCARBON-GARD Sealed Baffle TechECO-FLOW Backpressure-Reducing Baffle TechEZ-LOK Piston and Booster Assembly includedPerpetual Lifetime WarrantyCaliber .45caldB Rating -19.3dB (138.2dB on HK MK23 .45ACP Pistol)Diameter 1.375"Full Auto Rated YesLength 6.56" (Short Config), 8.81" (Full-Size Config)Material 17-4 H900 Stainless Steel, 7075-T6 AluminumMounting System 3-Lug, EZ-LOK, Taper MountSuppressor Type PistolUser Serviceable YesWeight 10.2 oz (Short Config), 13.3 oz (Full-Size Config)