The BOSS 5.56mm Vented End Cap for 1.5-Inch Housing in black (brand part no. EC-150-556-SS-VE-BLK) is the vented option for B.O.S.S. silencer models built on the 1.5-inch tube. B.O.S.S. lists the vented cap for gas blowback actions such as a traditional AR-15 and similar rifles. On the Chairman, the maker recommends the vented cap for AR-10 and AR-15 platforms because it dramatically reduces back pressure and gas exposure. It weighs 1.4 ounces and has a black nitride finish. The suppressor is sold separately.

Key Specifications

• The caliber size is 5.56mm, the bore size of this end cap.
• The design is vented, the gas blowback option in the two caps B.O.S.S. offers in this size.
• The intended action is gas blowback such as a traditional AR-15, per the maker’s listing.
• The housing fit is 1.5-inch B.O.S.S. tubes only, so it will not fit other housing diameters.
• The weight is 1.4 ounces, light enough to leave the suppressor’s balance unchanged.
• The finish is black nitride, a hard surface treatment for a part that gets screwed on and off.

Frequently Asked Questions

Is the vented cap the right one for an AR-15? B.O.S.S. lists the vented cap for gas blowback actions such as a traditional AR-15 and similar rifles. For AR-10 and AR-15 rifles or any other gas impingement firearm, the maker recommends the vented cap for dramatically reduced back pressure and gas exposure. Bolt guns should use the standard cap.

Will it fit a 1.75-inch B.O.S.S. housing? No. B.O.S.S. says its replacement end caps in this size only fit its 1.5-inch tubes.

Is a suppressor included? No. It is the replacement end cap only.

Buy the BOSS 5.56mm Vented End Cap for 1.5-Inch Housing, Black

Match the cap to your housing and caliber, then order it from our Lubbock, Texas gun shop for fast, insured shipping. More B.O.S.S. parts are in our silencers and suppressed firearms section.