Geissele Super Duty MOD1-A 300 Blackout 8" Bbl Ambidextrous Black SBR (NFA) 08-689B

The Geissele Super Duty MOD1-A 300 Blackout 8 SBR 08-689B takes the full-size MOD1-A's mechanical layout and compresses it into a short, close-quarters footprint. It's built specifically around the round's strengths, so the barrel is just long enough to let 300 Blackout do its job - full power supersonic performance and a genuinely quiet subsonic option once a suppressor's involved.

An 8" cold hammer forged, chrome-lined barrel with a 1:7 twist stabilizes the heavier subsonic bullets 300 BLK shooters actually run, while Geissele's Phased Array® gas system with Tri-Port® metering keeps the action cycling cleanly across a wide spread of ammunition and suppressor states. That kind of tuning is what separates a Geissele Super Duty MOD1 build from a rifle that just happens to be chambered in 300 Blackout.

Fully ambidextrous controls carry over from the larger Super Duty line - a left-side magazine release below the Maritime Bolt Catch and a dust-cover-actuated bolt catch/release on the right, so reloads stay instinctive no matter which hand is running the gun. The SSA-E X® trigger with Lightning Bow® adds a crisp, repeatable break that holds up shot after shot. A 7" MK16 M-LOK handguard with Geissele's Center Tab mating keeps the whole package rigid and optics-ready straight out of the box, which is exactly what a Geissele 300 Blackout SBR built for real work should offer.

This Geissele Super Duty 300 Blackout SBR runs on standard AR-15 magazines, so there's no proprietary feeding system to work around.

Key Features:

• 8" cold hammer forged, chrome-lined barrel, 1:7 twist
• Geissele Phased Array® gas system w/ Tri-Port™ metering
• Fully ambidextrous magazine release, bolt catch, and release controls
• SSA-E X® trigger with Lightning Bow®
• 7" MK16 M-LOK handguard w/ Geissele Center Tab
• Reliability Enhanced Bolt Carrier Group
• Compatible with standard AR-15 magazines
• 300 BLK SBR configuration optimized for suppressed and unsuppressed use

Compact, tuned specifically for its chambering, and built on hardware that's already proven itself at full size - 08-689B delivers a short-barrel platform shooters can run hard without second-guessing the fundamentals.