Geissele Super Duty SD-556 Mod 1 5.56 NATO AR-15, 14.5 in Pinned & Welded (16 in), Black, Ambidextrous Controls
This Geissele Automatics Super Duty Rifle SD-556 Mod 1 stands out as a factory-configured, feature-rich AR-15 in as-new condition. It pairs a 14.5-inch barrel with a pinned and welded three-prong flash hider to achieve a 16-inch legal length, and it is built with signature Geissele components including the Lightning-Bow trigger, Airborne Charging Handle (PN 05-497), a Geissele-marked BCG, and a Geissele-marked free-float M-LOK rail. Ambidextrous controls and a B5 Systems adjustable stock round out a well-executed, duty-grade configuration.
Condition
Overall Condition: As-new condition with no signs of prior handling beyond what’s typical from inspection (see photos).
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Rifling: Excellent - Sharp lands and grooves.
Specific Condition Notes: No evidence of use is apparent beyond normal factory or inspection handling.
What’s Included
- Geissele factory box with matching-serial end label (Super Duty SD-556 Mod 1, 14.5 in P&W, black)
- Paperwork
- One 30-round metal USGI-pattern AR-15 magazine (STANAG style)
The SD-556 Mod 1 configuration features a 14.5-inch barrel with a pinned and welded three-prong flash hider, providing a 16-inch overall legal length. The barrel is threaded, with the muzzle device permanently affixed at the factory. This setup delivers the compact handling of a 14.5-inch system while maintaining rifle-length compliance.
Geissele’s component suite is a highlight: the Lightning-Bow trigger, the Geissele Airborne Charging Handle (ACH, PN 05-497), and a Geissele-marked bolt carrier group are all factory-installed. The rifle also uses a Geissele-marked free-float M-LOK handguard with a full-length, T-marked Picatinny top rail for mounting accessories.
Controls are thoughtfully executed with ambidextrous features, including the safety selector and a right-side magazine release lever. An enlarged "maritime" bolt catch enhances manipulation. The ACH provides ambidextrous charging capability suited to a variety of setups.
Furniture includes a B5 Systems adjustable carbine stock with a 13.5-inch length of pull. The receiver set wears a black anodized finish that matches the rail. Chambered in 5.56mm NATO, the rifle has a 30+1 capacity and uses a direct-impingement, semi-automatic operating system.
This example is presented in as-new condition and comes with its Geissele factory box bearing the matching end label, paperwork, and one 30-round USGI-pattern magazine. The factory label confirms the Mod 1, 14.5-inch, pinned-and-welded black configuration.