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Sig Sauer M400 for Sale

Founded: 1976

HQ: Switzerland and Germany

The Sig Sauer M400 is a semi-automatic AR-15 rifle with a gas-operated direct-impingement, rotating-bolt action, most commonly chambered in 5.56×45mm NATO. Its signature feature is integration with Sig's TREAD accessory ecosystem. Over 88 Sig Sauer M400 auctions have run on FirearmLand. On FirearmLand, Sig Sauer M400 listings most often appear in 5.56 NATO and .223 Rem.

Sig Sauer M400 Auctions

2 active auctions ending soon

Sig Sauer M400 TREAD 5.56 NATO AR-15 AR15 16" M-400 +ORIG BOX

Sig Sauer M400 TREAD 5.56 NATO AR-15 AR15 16" M-400 +ORIG BOX

Sig Sauer M400 TREAD 556 AR-15 AR15 M-400

Sig Sauer M400 ROSE 5.56 NATO AR-15 AR15 16" M-400 +2 MAGS, ROMEO OPTICS

Sig Sauer M400 ROSE 5.56 NATO AR-15 AR15 16" M-400 +2 MAGS, ROMEO OPTICS

Sig Sauer M400 ROSE AR-15 AR15 M-400 +ORIG CASE

Recently Sold

Sig Sauer M400 Elite 5.56 AR-15 AR15 AR Sig-Sauer AR-15 M400 +ORIG BOX

Sold On 09/27/2024

Sig Sauer M400 Elite 5.56 AR-15 AR15 AR Sig-Sauer AR-15 M400 +ORIG BOX

Sig Sauer M400 AR-15 AR15 AR Sig Sauer-M400 AR-15

Sig Sauer M400 AR-15 AR15 AR CERAKOTE Sig-Sauer M400-AR-15 AR15-AR +3 MAGS

Sold On 08/30/2024

Sig Sauer M400 AR-15 AR15 AR CERAKOTE Sig-Sauer M400-AR-15 AR15-AR +3 MAGS

Sig Sauer M400 AR-15 AR15 AR Sig Sauer-M400

Sig Sauer SIG M400 Tread 5.56 NATO AR-15 AR15 AR 16" Sig-Sauer Sig M-400

Sold On 08/02/2024

Sig Sauer SIG M400 Tread 5.56 NATO AR-15 AR15 AR 16" Sig-Sauer Sig M-400

Sig Sauer SIG M400 Tread AR-15 AR15 AR Sig M-400

CUSTOM BUILT Sig Sauer M400 Enhanced 5.56 NATO AR-15 AR15 16" Geissele SSP

Sold On 04/19/2024

CUSTOM BUILT Sig Sauer M400 Enhanced 5.56 NATO AR-15 AR15 16" Geissele SSP

Sig Sauer M400 Enhanced AR-15 Geissele SSP +OPTIC

Sig Sauer M400 Enhanced 5.56 NATO 16" Black Anodized M400 M-400 +ORIG CASE

Sold On 03/25/2024

Sig Sauer M400 Enhanced 5.56 NATO 16" Black Anodized M400 M-400 +ORIG CASE

Sig Sauer M400 Enhanced Sig M-400 AR-15 AR15 2MAGS

Sig Sauer SIG-M400 Tread 5.56 NATO AR-15 Sig-Sauer SIG-M400 +OPTIC ROMEO5

Sold On 03/11/2024

Sig Sauer SIG-M400 Tread 5.56 NATO AR-15 Sig-Sauer SIG-M400 +OPTIC ROMEO5

Sig Sauer SIG-M400 Tread Sig Sauer-SIG-M400 AR15

Sig Sauer M400 Tread 5.56 NATO AR-15 AR15 AR Sig-Sauer M400 M-400 +ORIG BOX

Sold On 02/15/2024

Sig Sauer M400 Tread 5.56 NATO AR-15 AR15 AR Sig-Sauer M400 M-400 +ORIG BOX

Sig Sauer M400 Tread AR-15 AR15 AR Sig Sauer-M400

Sig Sauer SIG M400 Tread 5.56 NATO AR-15 AR15 AR 16" SIG-M400 AR-15-AR15 AR

Sold On 02/08/2024

Sig Sauer SIG M400 Tread 5.56 NATO AR-15 AR15 AR 16" SIG-M400 AR-15-AR15 AR

Sig Sauer SIG M400 Tread Sig Sauer-SIG M400 M-400

Sig Sauer M400 Tread 5.56 NATO 16" Black Anodized AR-15 AR15 AR M400

Sold On 12/17/2023

Sig Sauer M400 Tread 5.56 NATO 16" Black Anodized AR-15 AR15 AR M400

Sig Sauer M400 Tread AR-15 AR15 AR Sig Sauer-M400

Sig Sauer M400 Enhanced 5.56 NATO 16" AR-15 AR15 AR M400 M-400 2013

Sold On 11/30/2023

Sig Sauer M400 Enhanced 5.56 NATO 16" AR-15 AR15 AR M400 M-400 2013

Sig Sauer M400 Enhanced Sig Sauer-M400 M-400

Sig Sauer M400 5.56 NATO 16 Type III Hard Coat Anodized AR-15 AR15 AR M-400

Sold On 11/26/2023

Sig Sauer M400 5.56 NATO 16 Type III Hard Coat Anodized AR-15 AR15 AR M-400

Sig Sauer M400 AR-15 AR15 AR Sig Sauer-M400 M-400

Sig Sauer M400 Elite Titanium CA Compliant 5.56 NATO 16" M400 M-400 +OPTIC

Sold On 11/22/2023

Sig Sauer M400 Elite Titanium CA Compliant 5.56 NATO 16" M400 M-400 +OPTIC

Sig Sauer M400 AR-15 AR15 AR Sig Sauer-M400 M-400

CUSTOM Sig Sauer M400 5.56 NATO 16" AR-15 AR15 AR M400 M-400 AR-15

Sold On 10/19/2023

CUSTOM Sig Sauer M400 5.56 NATO 16" AR-15 AR15 AR M400 M-400 AR-15

TRICKED OUT Sig M400 AR-15 + BCM & Daniel Defense

Sig Sauer M400 Classic 5.56 NATO 16" AR-15 AR15 AR M400 M-400 2012

Sold On 10/12/2023

Sig Sauer M400 Classic 5.56 NATO 16" AR-15 AR15 AR M400 M-400 2012

Sig Sauer M400 AR-15 AR15 AR Sig M400 Sauer M-400

Sig Sauer M400 Tread 5.56 NATO 16" AR-15 Rifle AR15 AR-15 +Romeo5

Sold On 10/01/2023

Sig Sauer M400 Tread 5.56 NATO 16" AR-15 Rifle AR15 AR-15 +Romeo5

Sig Sauer M400 Tread AR-15 +ORIG BOX

Sig Sauer M400 Tread 5.56 NATO 16" Rifle CHROME LINED 30+1

Sold On 09/08/2023

Sig Sauer M400 Tread 5.56 NATO 16" Rifle CHROME LINED 30+1

Sig Sauer M400 Tread 5.56x45 Patrol Rifle

Sig Sauer M400 Tread 5.56 NATO Sig-Sauer M400-Tread Rifle 556x45 2MAGS

Sold On 09/07/2023

Sig Sauer M400 Tread 5.56 NATO Sig-Sauer M400-Tread Rifle 556x45 2MAGS

Sig Sauer M400 Tread

ORIG BOX Sig Sauer M400 TREAD Coil 5.56 NATO 16" 30+1 Sig-Sauer M400 OPTIC

Sold On 08/17/2023

ORIG BOX Sig Sauer M400 TREAD Coil 5.56 NATO 16" 30+1 Sig-Sauer M400 OPTIC

Sig Sauer M400 TREAD Coil

Sell a Gun Consign a Gun

NY COMPLIANT Sig Sauer M400 5.56 NATO Sig-Sauer M400 AR Rifle Black AR-15

Sold On 07/27/2023

NY COMPLIANT Sig Sauer M400 5.56 NATO Sig-Sauer M400 AR Rifle Black AR-15

Sig Sauer M400

Sig Sauer M400 Tread 300 Blackout Sig-Sauer M400 16" Tread AR-15 300 BLK AR

Sold On 07/25/2023

Sig Sauer M400 Tread 300 Blackout Sig-Sauer M400 16" Tread AR-15 300 BLK AR

Sig Sauer M400 Tread

Sig Sauer M400 Tread 16" 556 NATO Sig AR15 M400 556 Sig-Sauer AR15 + ROMEO5

Sold On 06/19/2023

Sig Sauer M400 Tread 16" 556 NATO Sig AR15 M400 556 Sig-Sauer AR15 + ROMEO5

Sig Sauer M400 Tread

NEW UNFIRED Sig Sauer M400 Tread 5.56 NATO Sig M400 5.56 223 400 Rifle AR15

Sold On 06/01/2023

NEW UNFIRED Sig Sauer M400 Tread 5.56 NATO Sig M400 5.56 223 400 Rifle AR15

Sig Sauer Tread M400

Sig Sauer SIG M400-TREAD SNAKEBITE SE 5.56 NATO AR-15 AR15 AR 16" +ORIG BOX

Sold On Invalid Date

Sig Sauer SIG M400-TREAD SNAKEBITE SE 5.56 NATO AR-15 AR15 AR 16" +ORIG BOX

Sig Sauer SIG M400-TREAD AR-15 AR15 AR Sig M400