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Sig Sauer MCX Rattler for Sale

Founded: 1976

HQ: Switzerland and Germany

The Sig Sauer MCX Rattler is an ultra-compact semi-automatic rifle/PDW with a short-stroke gas piston, built around .300 AAC Blackout. It is optimized for suppressed performance from a 5.5 inch barrel with .300 AAC Blackout. On FirearmLand, Sig Sauer MCX Rattler listings most often appear in .300 AAC Blackout (7.62x35mm) and 7.62x35mm.

Sig Sauer MCX Rattler Auctions

1 active auctions ending soon

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" PDW M-LOK ITD

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" PDW M-LOK ITD

Sig Sauer MCX Rattler 300-BLK-AAC SIDE-FOLDER

Recently Sold

Sig Sauer MCX Rattler LT 300 Blackout 6.75" PDW SUPPRESSED

Sold On 09/28/2026

Sig Sauer MCX Rattler LT 300 Blackout 6.75" PDW SUPPRESSED

Sig Sauer MCX Rattler LT DEAD AIR NOMAD SUPPRESSOR

Sig Sauer MCX Rattler PSB 300 Blackout 5.5" PDW +ORIG CASE, ROMEO OPTICS

Sold On 09/23/2026

Sig Sauer MCX Rattler PSB 300 Blackout 5.5" PDW +ORIG CASE, ROMEO OPTICS

Sig Sauer MCX Rattler SIDE FOLDER BRACE

Sig Sauer MCX Rattler 300 Blackout 8.5" PDW Short-Stroke Piston +CASE

Sold On 09/23/2026

Sig Sauer MCX Rattler 300 Blackout 8.5" PDW Short-Stroke Piston +CASE

Sig Sauer MCX Rattler 300-BLK-AAC

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" PDW +3 MAGS & ORIG BOX

Sold On 09/04/2026

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" PDW +3 MAGS & ORIG BOX

Sig Sauer MCX Rattler 300-BLK-AAC BRACE

Sig Sauer MCX Rattler 300 Blackout 5.5 PDW Short-Stroke Piston

Sold On 08/24/2026

Sig Sauer MCX Rattler 300 Blackout 5.5 PDW Short-Stroke Piston

Sig Sauer MCX Rattler SIDE-FOLDER BRACE

Sig Sauer MCX Rattler 300 Blackout 5.5" PDW Short-Stroke Piston

Sold On 08/21/2026

Sig Sauer MCX Rattler 300 Blackout 5.5" PDW Short-Stroke Piston

Sig Sauer MCX Rattler 300-BLK-AAC SIDE-FOLDER

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5 Coyote Tan PDW

Sold On 08/14/2026

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5 Coyote Tan PDW

Sig Sauer MCX Rattler Radian Raptor-LT SOCOM CPDW

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" FDE +2 MAGS & ORIG BOX

Sold On 08/12/2026

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" FDE +2 MAGS & ORIG BOX

Sig Sauer MCX Rattler THREADED, SD-MLOK, ITD

Sig Sauer MCX Rattler 300 Blackout 5.5 PDW Bufferless THREADED

Sold On 07/29/2026

Sig Sauer MCX Rattler 300 Blackout 5.5 PDW Bufferless THREADED

Sig Sauer MCX Rattler Short-Stroke Piston

Sig Sauer MCX Rattler PCB 300 Blackout 6.75" USSOCOM PDW

Sold On 06/19/2026

Sig Sauer MCX Rattler PCB 300 Blackout 6.75" USSOCOM PDW

Sig Sauer MCX Rattler PCB Original Pre-LT FOLDER

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" Two-Tone FDE & Black

Sold On 06/15/2026

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" Two-Tone FDE & Black

Sig Sauer MCX Rattler FOLDER SD Handguard THREADED

Sig Sauer MCX Rattler 300 Blackout 5.5" PDW Short-Stroke Piston +ORIG CASE

Sold On 05/29/2026

Sig Sauer MCX Rattler 300 Blackout 5.5" PDW Short-Stroke Piston +ORIG CASE

Sig Sauer MCX Rattler SIDE FOLDER, THREADED, M-Lok

Sig Sauer MCX Rattler SBR 5.56 NATO 6.75" PDW GEISSELE SD FLAT TRIGGER

Sold On 05/22/2026

Sig Sauer MCX Rattler SBR 5.56 NATO 6.75" PDW GEISSELE SD FLAT TRIGGER

Sig Sauer MCX Rattler SBR 556 Short-Stroke Piston

Sig Sauer MCX Rattler Canebrake 300 Blackout FDE THREADED PISTON +3 MAGS

Sold On 05/11/2026

Sig Sauer MCX Rattler Canebrake 300 Blackout FDE THREADED PISTON +3 MAGS

Sig Sauer MCX Rattler SD-Handguard SIDE FOLDER

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" +SRD762Ti SUPPRESSOR

Sold On 04/24/2026

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" +SRD762Ti SUPPRESSOR

Sig Sauer MCX Rattler 300-BLK-AAC PDW FOLDER

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" FDE PDW+2 MAGS

Sold On 04/06/2026

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" FDE PDW+2 MAGS

Sig Sauer MCX Rattler 300-BLK-AAC

Sig Sauer MCX Rattler 300 Blackout 5.5" Holosun ACSS Red Dot AR-15 AR15

Sold On 04/03/2026

Sig Sauer MCX Rattler 300 Blackout 5.5" Holosun ACSS Red Dot AR-15 AR15

Sig MCX Rattler 300-BLK 300BLK PDW AR-15 AR15

PDW Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5"

Sold On 03/09/2026

PDW Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5"

Sig Sauer MCX Rattler Coyote 300-BLK-AAC

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SUPPRESSOR READY Sig Sauer MCX Rattler LT 5.56 NATO 7.75" +ORIG BOX

Sold On 03/06/2026

SUPPRESSOR READY Sig Sauer MCX Rattler LT 5.56 NATO 7.75" +ORIG BOX

PDW Sig Sauer MCX Rattler LT 5.56X45 Piston 556

MIAMI TIGER! Sig Sauer MCX-Rattler LT Custom Works 300BLK 6.75" +OPTIC

Sold On 03/04/2026

MIAMI TIGER! Sig Sauer MCX-Rattler LT Custom Works 300BLK 6.75" +OPTIC

LIMITED! Sig Sauer MCX-Rattler 300-Blackout PDW

Sig Sauer MCX Rattler 300 Blackout 6.75" AR15 AR-15 Tactical PDW +2 MAGS

Sold On 02/23/2026

Sig Sauer MCX Rattler 300 Blackout 6.75" AR15 AR-15 Tactical PDW +2 MAGS

Sig Sauer MCX Rattler 300-BLK-AAC CQB Defense

Sig Sauer MCX-Rattler LT 300 Blackout 6.75" Black AR15 AR Pistol +ORIG BOX

Sold On 02/06/2026

Sig Sauer MCX-Rattler LT 300 Blackout 6.75" Black AR15 AR Pistol +ORIG BOX

Sig Sauer MCX-Rattler LT R 300-BLK-AAC LTR Defense

Sig Sauer MCX Rattler 300 Blackout 5.5" AR Pistol

Sold On 02/04/2026

Sig Sauer MCX Rattler 300 Blackout 5.5" AR Pistol

Sig MCX Rattler 300-BLK-AAC PDW 300Blk

SUPPRESSED SBR Sig Sauer MCX Rattler 300 Blackout 5.5" Folding Stock

Sold On 01/14/2026

SUPPRESSED SBR Sig Sauer MCX Rattler 300 Blackout 5.5" Folding Stock

Sig Sauer MCX Rattler SBR 300-BLK-AAC PDW M-LOK

Sig Sauer MCX Rattler 5.56 NATO 6.75" Gas-Piston AR15 AR-15 PDW +ORIG BOX

Sold On 12/29/2025

Sig Sauer MCX Rattler 5.56 NATO 6.75" Gas-Piston AR15 AR-15 PDW +ORIG BOX

Sig Sauer MCX Rattler 556 AR15 AR-15 Folding Brace

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" Coyote Tan PDW M-LOK

Sold On 12/15/2025

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" Coyote Tan PDW M-LOK

Sig Sauer MCX Rattler 300-BLK-AAC Suppressor-Ready

Sig Sauer MCX Rattler PCB 5.56mm NATO .223 Rem 5.5" PDW AR15 AR-15 +2 MAGS

Sold On 11/24/2025

Sig Sauer MCX Rattler PCB 5.56mm NATO .223 Rem 5.5" PDW AR15 AR-15 +2 MAGS

Sig Sauer MCX Rattler Folding Tactical AR15 AR-15

Sig Sauer MCX Rattler LT 300 Blackout 6.75" Defense Pistol PDW +2 MAGS

Sold On 10/27/2025

Sig Sauer MCX Rattler LT 300 Blackout 6.75" Defense Pistol PDW +2 MAGS

Sig Sauer MCX Rattler LT 300-BLK-AAC Tactical

Sig Sauer MCX Rattler Canebrake 300 Blackout AAC 5.5" Coyote AR-15 AR15

Sold On 10/24/2025

Sig Sauer MCX Rattler Canebrake 300 Blackout AAC 5.5" Coyote AR-15 AR15

Sig Sauer MCX Rattler 300-BLK Tactical-PDW 300BLK

SOCOM PDW Sig Sauer MCX Rattler 300 Blackout 5.5" +2 MAGS & ORIG BOX

Sold On 10/20/2025

SOCOM PDW Sig Sauer MCX Rattler 300 Blackout 5.5" +2 MAGS & ORIG BOX

COMPACT Sig MCX Rattler 300-BLK-AAC 300BLK

PDW! Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" Coyote Cerakote

Sold On 10/13/2025

PDW! Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" Coyote Cerakote

TWO TONE MCX Rattler 300-BLK-AAC 300BLK

Sig Sauer MCX Rattler PSB 300 Blackout 5.5" +ORIG BOX

Sold On 09/19/2025

Sig Sauer MCX Rattler PSB 300 Blackout 5.5" +ORIG BOX

Sig Sauer MCX 300-BLK-AAC PDW

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" Coyote Tan +3 MAGS

Sold On 08/29/2025

Sig Sauer MCX Rattler Canebrake 300 Blackout 5.5" Coyote Tan +3 MAGS

Sig Sauer MCX Rattler 300-BLK-AAC

Sig Sauer MCX-Rattler LT Pistol PCB 300 Blackout AR-15 AR15 6.75" Black

Sold On 08/18/2025

Sig Sauer MCX-Rattler LT Pistol PCB 300 Blackout AR-15 AR15 6.75" Black

Sig Sauer MCX-Rattler Pistol PCB 300-BLK-AAC AR-15

Sig Sauer MCX Rattler 5.56 NATO 5.5"

Sold On 08/08/2025

Sig Sauer MCX Rattler 5.56 NATO 5.5"

Sig Sauer MCX Rattler 556

RARE Sig Sauer MCX Rattler CUSTOM WORKS MIAMI TIGER STRIPE with ROMEO8T

Sold On 07/28/2025

RARE Sig Sauer MCX Rattler CUSTOM WORKS MIAMI TIGER STRIPE with ROMEO8T

Sig Sauer MCX Rattler 300 AAC +3 MAGS & ORIG CASE

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