The Energetic Armament 5.56mm accessory end cap gives a tighter bore aperture sized for 5.56mm rounds (Energetic Armament part no. EA33). It is machined in the USA from 17-4PH stainless steel and finished in black nitride. The cap has no provision for installing a wipe, since wipes are generally not recommended for supersonic 5.56mm use. At 0.89 ounce it adds very little weight to the front of a suppressor. For shooters who run 5.56mm and want a cap built around that cartridge, it is a simple and durable part.

Key Specifications

• The aperture is sized for 5.56mm, a tighter bore than a general-purpose end cap.
• The material is American-made 17-4PH stainless steel, a hard alloy suited to a part at the muzzle end.
• The finish is black nitride, which adds wear and corrosion resistance.
• The cap weighs 0.89 ounce, so it leaves the weight of a suppressor nearly unchanged.
• The cap has no provision for a wipe, which suits supersonic 5.56mm use.

Frequently Asked Questions

Can I install a wipe in this cap? No. Energetic Armament states this cap does not include provisions for installing a wipe, because wipes are generally not recommended for supersonic 5.56mm use.

What is this cap for? It is an accessory end cap that provides a tighter bore aperture for use with 5.56mm rounds.

What is it made of? American-made 17-4PH stainless steel with a black nitride finish.

Buy the Energetic Armament 5.56mm Accessory End Cap, 17-4PH Stainless

Small parts shape how a suppressor build handles, and the aperture is one of them. This cap pairs a 5.56mm-sized opening with a hard stainless body and a black nitride finish. Order it with the rest of our Class 3 parts and accessories from our Lubbock, Texas gun shop for fast, insured shipping.