BOSS Vented End Cap Features The Boss Suppressors Vented End Cap is machined from stainless steel and finished in black to match factory Boss silencer construction. It is sized for 1.5-inch diameter Boss suppressor models bored to 5.56mm so it threads onto compatible hosts without any extra fitting. The vented design is intended to help manage internal gas pressure through the suppressor s baffle stack as rounds cycle. This gives the end cap a functional role beyond simply sealing the suppressor body. Keeping a stainless vented end cap on hand lets an owner service or rebuild their Boss 1.5-inch suppressor rather than replacing the whole unit. The black finish matches the rest of the suppressor s exterior for a consistent look. Because it is built to Boss Suppressors own model specifications it installs as a direct factory replacement part. It is available for sale at GrabAGun for shooters maintaining their Boss 5.56mm suppressor setup. BOSS Vented End Cap Specifications Manufacturer: BOSS Color: Black Caliber: 5.56 Compatible Hosts: 1.5 Boss Silencer Models Available At: GrabAGun