Geissele Super Duty MOD 1 5.56 NATO 13.9"Bbl Desert Dirt Color Short Barrel Rifle (NFA) 08-521S

Geissele Super Duty MOD 1 5.56 NATO 13.9" DDC SBR 08-521S carries the same core Super Duty engineering as the ambidextrous MOD1-A builds, just on a standard Mil-Spec lower rather than the billet ambi receiver - a straightforward, proven configuration for shooters who don't need mirrored bolt/mag controls.

The barrel is cold hammer forged, chrome-lined, and cut to a 1:7 twist on Geissele's tapered profile, running a mid-length gas system through a Super Compact Gas Block with a .079" gas port. This Geissele Super Duty 13.9 build channels that gas through a Nanoweapon®-coated Reliability Enhanced Bolt Carrier Group with a forged Stressproof Bolt, holding up to sustained round counts better than standard bolts.

The Geissele 13.9 Super Duty platform's SSA-E X® trigger with Lightning Bow® splits the difference between a classic M4 trigger and a flat-bow design, giving a smooth first-stage takeup and a crisp second-stage break. A 12.9" MK16 rail with Geissele's Center Tab mating keeps the front end rigid, and a B5 Systems Enhanced SOPMOD stock rides a mil-spec buffer tube with QD endplate for a solid, adjustable cheek weld.

Key Features:

• 13.9" cold hammer forged, chrome-lined barrel, 1:7 twist
• Mid-length gas system, .079" gas port, Super Compact Gas Block
• Nanoweapon®-coated Reliability Enhanced BCG, forged Stressproof Bolt
• SSA-E X® trigger with Lightning Bow®
• 12.9" MK16 rail w/ Geissele Center Tab
• B5 Systems Enhanced SOPMOD stock
• Airborne Charging Handle (ACH®)
• Approx. 6.65 lbs, DDC finish

This Geissele Super Duty SBR delivers the same engineering as its pinned-and-welded siblings in a true short-barrel configuration, chambered in 5.56 NATO for shooters ready to make the NFA transfer.