The Liberty Precision Machine Eclipse Flash Hider, 13.7-inch Pin-Weld configuration (Liberty part no. LPM-2007), is a .30 caliber muzzle device threaded 1/2×28 and sized specifically to be permanently pinned and welded onto a 13.7-inch barrel, bringing the total barrel length up to the federal 16-inch minimum for rifles. That extra permanently attached length lets a 13.7-inch-barreled rifle run legally as a standard rifle rather than requiring NFA registration as a short-barreled rifle. Liberty Precision Machine built the Eclipse as a standalone flash hider rather than a suppressor mount, and recommends always confirming alignment before use. It’s the compliance-focused option for anyone building a 13.7-inch-barreled AR-pattern rifle who wants to stay at legal rifle length without giving up flash reduction.

Key Specifications

• Rated for .30 caliber and under.
• Threaded 1/2×28.
• Sized to be pinned and welded onto a 13.7-inch barrel, bringing total length to the federal 16-inch rifle minimum.
• Part of Liberty’s Eclipse flash hider line.
• Liberty recommends confirming alignment before use.
• Pinning and welding must be done by a qualified gunsmith to comply with ATF requirements for a permanent attachment.

Frequently Asked Questions

Why would I pin and weld a flash hider onto my barrel? Permanently attaching this device to a 13.7-inch barrel brings the total length to 16 inches, meeting the federal minimum for a rifle so it doesn’t require NFA short-barreled-rifle registration.

Can I install this myself? Pinning and welding a muzzle device to meet federal length requirements should be done by a qualified gunsmith to ensure it’s permanent and compliant.

Does this flash hider work as a suppressor mount? No, it’s a standalone flash hider, not a suppressor mounting platform.

Buy the Liberty Precision Machine Eclipse Flash Hider, 13.7-inch Pin-Weld

Order this Liberty Precision Machine flash hider from our AR muzzle devices selection and keep your 13.7-inch build at legal rifle length. Ships fast from our Lubbock, Texas gun shop.