Versatility Defined: Discover the M400 Collection
The M400 lineup now features an expanded color palette and the elegantly designed ROSE edition, offering a level of sophistication to match its rugged durability. Whether you prefer a fully kitted setup with integrated optics or a more tailored aesthetic, there is a configuration designed specifically for you. Don’t miss the chance to own a rifle that balances exceptional form with world-class function.
Explore the Full M400 Lineup
New Colors Available! Make it your own. The SIG M400 series is now available in an expanded color palette. Proven reliability, personalized for you.
New to the SIG Webstore – M400 Upper Assemblies
Swap or build your own M400 rifle with a traditional M4/AR lower receiver
SIG M400 UPPER RECEIVER ASSEMBLY – 11.5″ 5.56 NATO
$1,199.99
SIG M400 UPPER RECEIVER ASSEMBLY – 16″ 5.56 NATO
$999.99$1,199.99
Deck Out Your M400 Rifle
ROMEO8T 1x38MM
$799.99
ROMEO5 GEN II ELITE 1X20MM
$199.99
ROSE M400 5.56 NATO 30RD MAGAZINE – GLITTER GUNZ – MAGPUL
$34.99
MCX/M400 5.56 NATO 30RD MAGAZINE – GEN M3 PMAG-MAGPUL
$29.99
More Must-Have M400 Accessories
FOXTROT-MSR™ FULL-SIZE
$199.99
FOXTROT-MSR™ COMPACT
$189.99
TREAD VERTICAL GRIP KIT
$49.99
SIG SAUER Single Point Bungee Sling
$59.99
BAYONET MOUNT ASSEMBLY – M-LOK
$59.99
QD SLING MOUNT – M-LOK – MAGPUL
$19.99
SIG SAUER 72 PEASE BLVD NEWINGTON, New Hampshire 03801
FOG HORN 