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Geissele Automatics SD-556 for Sale

Founded: 2004

HQ: United States

The Geissele Automatics SD-556 is a gas-operated, rotating-bolt, direct-impingement semi-auto rifle in 5.56×45mm NATO featuring a Reliability Enhanced Bolt Carrier Group with nanocoating. Its hallmark is the pinned and keyed Super Gas Block.

Geissele Automatics SD-556 Auctions

1 active auctions ending soon

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 16" SD556

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 16" SD556

Geissele SD-556 AR-15 AR15 SSA-E Nanoweapon BCG

Recently Sold

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 10.3" FDE SD556

Sold On 08/07/2026

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 10.3" FDE SD556

Geissele Automatics SD-556 AR-15 AR15 SD556 BRACE

SBR Geissele Automatics Super Duty SD-556 Mod 1 AR-15 AR15 11.5" +ORIG CASE

Sold On 07/31/2026

SBR Geissele Automatics Super Duty SD-556 Mod 1 AR-15 AR15 11.5" +ORIG CASE

Geissele Super Duty SD-556 AR-15 AR15 SD556

Geissele Automatics SD-556 Super Duty AR-15 AR15 Tan SD556 +CASE

Sold On 07/24/2026

Geissele Automatics SD-556 Super Duty AR-15 AR15 Tan SD556 +CASE

Geissele SD-556 SD556 AR-15 AR15 14.5 P&W

SBR Geissele Automatics Super Duty SD-556 AR-15 AR15 SD556 UNITY RISER

Sold On 07/22/2026

SBR Geissele Automatics Super Duty SD-556 AR-15 AR15 SD556 UNITY RISER

Geissele Super Duty AR-15 AR15 SD 556 SD556 OLIGHT

GEISSELE Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 16.5" P&W SD556

Sold On 06/24/2026

GEISSELE Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 16.5" P&W SD556

Geissele Automatics SD-556 AR-15 AR15 DDC RAIL

GEISSELE Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 SD556 ACH

Sold On 06/24/2026

GEISSELE Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 SD556 ACH

Geissele Automatics Super Duty SD-556 AR-15 AR15

GEISSELE AUTOMATICS Super Duty SD-556, MOD 1 5.56 NATO AR-15 AR15 +ORIG BOX

Sold On 06/17/2026

GEISSELE AUTOMATICS Super Duty SD-556, MOD 1 5.56 NATO AR-15 AR15 +ORIG BOX

Geissele Super Duty AR-15 AR15 FACTORY CORRECT

GEISSELE Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 16 DDC +TRIGGER!

Sold On 06/15/2026

GEISSELE Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 16 DDC +TRIGGER!

Geissele Super Duty SD-556 AR-15 SD556 SMR MK16

Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 11.5 DDC MK16

Sold On 06/07/2026

Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 11.5 DDC MK16

Geissele Super Duty SD-556 AR-15 AR15 SF MUZZLE

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 16" SD556 CAMO

Sold On 05/20/2026

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 16" SD556 CAMO

Geissele Automatics SD-556 SD556 AR15 AR 15 M-Lok

Geissele SD-556 Super Duty Daniel Defense DDM4V7S 5.56 AR-15 AR15 11.5"

Sold On 04/10/2026

Geissele SD-556 Super Duty Daniel Defense DDM4V7S 5.56 AR-15 AR15 11.5"

Geissele Daniel Defense SD-556 DDM4-V7S AR-15 AR15

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 16.1" M-LOK

Sold On 03/27/2026

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 16.1" M-LOK

Geissele SD556 AR-15 AR15

Geissele Automatics Super Duty MOD 1 Pistol SD-556 AR-15 AR15 +ORIG BOX

Sold On 01/21/2026

Geissele Automatics Super Duty MOD 1 Pistol SD-556 AR-15 AR15 +ORIG BOX

Geissele Automatics Super Duty AR15 AR 556 SD556

Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 11.5" M-LOK

Sold On 12/15/2025

Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 11.5" M-LOK

Geissele Automatics Super Duty SD-556 AR-15 AR15

LIKE-NEW Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 16" DDC

Sold On 11/14/2025

LIKE-NEW Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 16" DDC

Geissele Super Duty 556 AR-15 AR15 M-LOK SureFire

Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 16" Sport Rifle

Sold On 11/07/2025

Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 16" Sport Rifle

Geissele Super Duty SD556 AR-15 AR15 556 Defense

CLEAN! Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 12.5" SD556

Sold On 10/31/2025

CLEAN! Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 12.5" SD556

Geissele Super Duty AR-15 PISTOL AR15 FDE M-LOK

Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 16.1" Rifle

Sold On 10/27/2025

Geissele Automatics Super Duty SD-556 5.56 NATO AR-15 AR15 16.1" Rifle

Geissele Automatics Super Duty 556 AR-15 AR15

Sell a Gun Consign a Gun

Geissele SD-556 Super Duty MOD1 SBA3 5.56 NATO AR-15 AR15 11.5" +2 MAGS

Sold On 10/24/2025

Geissele SD-556 Super Duty MOD1 SBA3 5.56 NATO AR-15 AR15 11.5" +2 MAGS

Geissele SD-556 SD556 AR-15 AR15 Tactical Pistol

Geissele Automatics Super Duty MOD1 SD-556 5.56 NATO AR-15 AR15 OD Green

Sold On 10/01/2025

Geissele Automatics Super Duty MOD1 SD-556 5.56 NATO AR-15 AR15 OD Green

Geissele Super Duty 556 AR-15 AR15 16.25" Rifle

Geissele Automatics Super Duty MOD 1 SD-556 AR-15 5.56-NATO AR15 16" SD556

Sold On 08/18/2025

Geissele Automatics Super Duty MOD 1 SD-556 AR-15 5.56-NATO AR15 16" SD556

Geissele Automatics Super Duty 556 AR-15 AR15

Geissele Automatics SD-556 Super Duty Rifle 5.56 NATO AR-15 AR15 16.0"

Sold On 07/25/2025

Geissele Automatics SD-556 Super Duty Rifle 5.56 NATO AR-15 AR15 16.0"

Geissele SD-556 AR-15 AR15 SD556

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 10.3" +ORIG BOX

Sold On 07/14/2025

Geissele Automatics SD-556 Super Duty 5.56 NATO AR-15 AR15 10.3" +ORIG BOX

Geissele Automatics SD-556 AR-15 AR15

Geissele Automatics SD-556 SD556 Super Duty 5.56 NATO AR-15 AR15 10.5

Sold On 07/04/2025

Geissele Automatics SD-556 SD556 Super Duty 5.56 NATO AR-15 AR15 10.5

Geissele Automatics SD-556 SD556 AR-15 AR15

Geissele SD-556 Super Duty 5.56 NATO AR-15 AR15 AR 16" Geissele-SD-556

Sold On 04/14/2025

Geissele SD-556 Super Duty 5.56 NATO AR-15 AR15 AR 16" Geissele-SD-556

Geissele SD-556 AR-15 AR15 AR Geissele Super Duty

SBR Geissele Automatics SD556 5.56 NATO DD-MK18 Upper 10" SD-556 AR-15-AR15

Sold On 04/11/2025

SBR Geissele Automatics SD556 5.56 NATO DD-MK18 Upper 10" SD-556 AR-15-AR15

Geissele Automatics SD-556 AR-15 AR15 AR DD-MK18

Geissele Automatics SD-556 Super Duty OD Green Geissle-SD-556 Super-Duty

Sold On 02/28/2025

Geissele Automatics SD-556 Super Duty OD Green Geissle-SD-556 Super-Duty

Geissele Automatics SD-556 16" Geissele Super Duty

Geissele Automatics SD-556 Super Duy 5.56 NATO AR-15 AR15 SD-556 Geissele

Sold On 10/11/2024

Geissele Automatics SD-556 Super Duy 5.56 NATO AR-15 AR15 SD-556 Geissele

Geissele SD-556 AR-15 AR15 AR-Pistol Geissele

Geissele Automatics SD-556 Super Duty 5.56 NATO 10.3" FDE SD-556 +OPTIC

Sold On 02/15/2024

Geissele Automatics SD-556 Super Duty 5.56 NATO 10.3" FDE SD-556 +OPTIC

Geissele Automatics SD-556 AR-15 AR15 AR