New Uppers Are Here
The perfect rifle build starts with the right components. We’re excited to announce two new complete, drop-in upper assemblies, now available at the SIG Webstore. These complete kits include everything you need to upgrade your AR lower.
MCX-SPEAR LT 9″ Upper AR Conversion Kit 300BLK – FDE
$1,699.99
The MCX-SPEAR LT developed for the Special Forces community is the most advanced platform of its kind. Convert any M4/AR15 platform into a modernized folding firearm with superior reliability, durability, and accuracy.
SIG AR UPGRADE KIT
$1,199.99
Take your rifle to the next level! Upgrade your M4/AR rifle or lower assembly with this complete, drop-in M400 upper assembly. This kit includes all the necessary components for a complete swap, including a two-stage match trigger as well as the popular TANGO-MSR LPVO 1-6X24 (SFP) riflescope.
Looking to build the perfect rifle setup? Check out our new Deck Out Your MCX website feature. Learn how to customize your MCX with the ideal accessories, from optics and suppressors to folding stocks and grips.
Outfit Your MCX
ROMEO8T-AMR™ Red Dot Sight
$699.99
Collapsing/ Telescoping Stock
$299.99
Pistol Brace, Folding, Locking
$249.99
SHOP ALL PISTOL BRACES AND STOCKS
300BLK Magazines
MCX/M400 .300 BLK 30rd Aluminum Magazine
$17.99
MCX/M400 .300 BLK 30rd Magazine – GEN M3 PMAG
$29.99
300BLK Ammunition
300BLK, 125gr, Elite Match Grade, OTM, Staked, Sealed
$39.99
300BLK Subsonic, 220gr, Tactical Rifle, OTM, Staked, Sealed
$44.99
SIG SAUER 72 PEASE BLVD NEWINGTON, New Hampshire 03801
FOG HORN 