Geissele Super Duty SD-556 14.5" 5.56 NATO OD Green Sig Romeo4H Red Dot FailZero BCG

Description:
MANUFACTURER: GEISSELE AUTOMATICS 
MODEL: SUPER DUTY SD-556 
CONFIGURATION: SUPER DUTY 14.5" M-LOK CARBINE 
YEAR MANUFACTURED: MODERN PRODUCTION
COUNTRY OF ORIGIN: UNITED STATES 
SERIAL NUMBER: SD556-037037 
ROLLMARKS: GEISSELE AUTOMATICS / NORTH WALES, PA / SUPER DUTY / SD-556 / CAL. 5.56 / SD556-037037 
CALIBER: 5.56 NATO 
CAPACITY: 30+1 ROUNDS 
BARREL LENGTH: 14.50" 
BARREL FEATURES: THREADED, COLD HAMMER FORGED, CHROME-LINED, MID-LENGTH GAS SYSTEM
MUZZLE / THREAD PITCH: BCM GUNFIGHTER COMPENSATOR / 1/2x28 
OPERATING SYSTEM: DIRECT IMPINGEMENT 
ACTION: SEMI-AUTO 
TWIST RATE: 1:7 
TRIGGER: GEISSELE SSA TWO-STAGE 
WEIGHT (UNLOADED): 6.90 LBS 
CONFLICT ORIGIN: GWOT 
IRON SIGHTS: FDE MAGPUL MBUS PRO POLYMER FLIP-UP SIGHTS
OPTICS: SIG SAUER ROMEO4H RED DOT
UPPER / LOWER: 7075-T6 FORGED ALUMINUM 
HANDGUARD / GRIP TYPE: GEISSELE MK16 M-LOK FREE FLOAT HANDGUARD / MAGPUL MOE GRIP 
FIREARM FINISH: OD GREEN HARDCOAT ANODIZED 
CONDITION: GOOD CONDITION. MINOR FINISH WEAR PRESENT
ADDITIONAL FEATURES: FAILZERO NICKEL BORON BOLT CARRIER GROUP, SIG SAUER ROMEO4H RED DOT, BCM GUNFIGHTER COMPENSATOR, ADJUSTABLE MAGPUL MOE STOCK, MAGPUL MBUS SIGHTS 
WHAT’S INCLUDED: RIFLE, SIG SAUER ROMEO4H, MAGPUL MBUS SIGHTS

When Geissele builds a rifle, it's built with one purpose in mind—hard use. The Super Duty isn't a dressed-up sporting rifle pretending to be tactical. It's a professional-grade fighting carbine engineered for duty, defensive applications, high-round-count training, and shooters who expect absolute reliability every time the bolt goes into battery. From patrol work to weekend range work, this rifle is built to take abuse and keep running.

The heart of the rifle is its 14.5-inch cold hammer forged, chrome-lined barrel paired with Geissele's smooth-shooting mid-length direct impingement system. The legendary Geissele SSA two-stage trigger delivers a clean, predictable break that has earned its reputation among military professionals and serious civilian shooters alike. This particular rifle takes things a step further with a premium FailZero Nickel Boron bolt carrier group, offering exceptional lubricity, simplified cleaning, and outstanding long-term durability; while the BCM Gunfighter compensator keeps muzzle movement flat during rapid strings.

The Geissele MK16 free-float M-LOK handguard provides outstanding rigidity while maintaining a slim, ergonomic profile that feels planted in the hand. Magpul MOE furniture offers excellent control and comfort without unnecessary bulk, while the FDE Magpul MBUS folding sights provide dependable backup aiming capability. Controls are clean, intuitive, and exactly what experienced AR shooters expect from a premium duty-grade platform.

Modern readiness is where this rifle really shines. Sitting atop the receiver is a SIG Sauer ROMEO4H red dot already mounted and ready to go. The continuous Picatinny rail, generous M-LOK attachment points, and BCM muzzle device make the rifle fully prepared for lights, slings, lasers, suppressor-ready upgrades, or whatever mission-specific accessories the next owner chooses. Every major component reflects quality over compromise.

There are AR-15's... and then there are rifles that separate themselves the moment you pick them up. The Geissele Super Duty has earned its reputation by refusing to compromise where it matters—reliability, durability, and performance under hard use. This example pushes that standard even further with a FailZero Nickel Boron bolt carrier group, BCM Gunfighter compensator, and SIG ROMEO4H optic already in place. It's the kind of rifle you build after years of experience—except someone else already spent the money and made the right decisions. Whether it's your go-to defensive carbine, your next training rifle, or the centerpiece of a serious collection of modern fighting rifles, this Super Duty is ready to run hard from day one. Skip the cookie-cutter builds and bargain-bin parts. Buy the rifle that serious shooters reach for when failure isn't an option.

***Please see pictures for condition and wear***

SHIPPING INFORMATION:
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PROCEDURES:
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DISCLAIMER
All pre-owned firearms offered by National Armory are thoroughly inspected by our on-site gunsmith to ensure they are in proper working condition. While test firing may or may not be conducted, all firearms are evaluated for basic function and safety. It is solely the buyer’s responsibility to be familiar with and comply with all federal, state, and local laws regarding firearm ownership and accessory restrictions, including but not limited to magazine capacity and prohibited features. All sales are final.

Rifle Caliber: 5.56x45mm NATO
Manufacturer: GEISSELE
Model: SUPER DUTY
Serial Number: SD556-037037
Barrel Length: 14.50
Condition: VERY GOOD

Price: $1,899.99
Shipping: $39.99
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