The Energetic Armament 5.56mm Accessory End Cap (brand part number EA33) is a replacement end cap sized specifically for 5.56mm use, giving shooters a tighter bore aperture than a general-purpose cap allows. Energetic Armament machines the cap from 17-4PH stainless steel domestically in the USA and finishes it in black nitride for corrosion resistance and a durable, long-wearing surface. Unlike some end caps, this version does not include provision for installing a wipe, which is intentional since wipes are generally not recommended for supersonic 5.56mm use anyway. For shooters running a suppressor or muzzle device compatible with this cap style, it’s a straightforward way to dial in a bore aperture matched to 5.56mm-specific performance.

Key Specifications

• Provides a tighter bore aperture sized for 5.56mm rounds.
• Machined from 17-4PH stainless steel.
• Manufactured domestically in the USA.
• Finished in black nitride for corrosion resistance.
• Does not include wipe provision, since wipes aren’t recommended for supersonic 5.56mm use.

Frequently Asked Questions

Does this cap support a wipe? No, it does not include provision for a wipe, since wipes are generally not recommended for supersonic 5.56mm use.

What’s it made from? American-made 17-4PH stainless steel with a black nitride finish.

Buy the Energetic Armament 5.56mm Accessory End Cap – Stainless Steel

Dial in a bore aperture matched to 5.56mm performance. Order it from our Energetic Armament lineup, part of our Class 3 parts and accessories selection, at our Lubbock, Texas gun shop for fast, direct shipping.