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Sig's MCX Carbine

Sig Sauer MCXWe've known for some time now about the MCX (Mission Configurable Weapon System) thanks to Sig's Instagram account. Sig Sauer is making it more official now though and we're seeing a lot of information become available. For those familiar with Sig's 556 line, the MCX is much like an evolution to that line. The 556 requires a proprietary lower (and the upper is serialized instead of the lower) but it is a short stroke piston system. The advantage to the MCX is that it will run on a regular AR-15 lower.

The MCX has an ambidextrous safety, mag release, and charging handle.

The MCX is designed to allow quick caliber changes between 5.56mm, .300 Blackout, and 7.62x39 (requires a different bolt as well). The MCX has a short stroke auto regulating gas operating system, modular rail system, and uses a standard AR magazine. It also has a nickel boron bolt and bolt carrier.

Sig will offer Caliber X-Change kits for swapping between calibers of MCX rifles and pistols. Based on what we are seeing, the pistol will only be offered with a PSB kit pre-installed. Judging by the photos the PSB /adapter doesn't side fold.

Below are the MCX models slated for release in 2015. We don't yet have info on availablility or pricing of the MCX Caliber X-Change Kits.

MCX Rifles

Part Number Description MSRP
RMCX-300B-16B-TFSAL-P-CKIT SIGMCX, 300BLK, Rifle, 16in bbl, Patrol, BLK, Semi-Auto, Folding Sights, Folding Stock, (1) 30rd Alum Mag, Alum HGD, 5.56mm Cal-X Kit Included, Poly Hard Case $2,132.00
RMCX-16B-TFSAL-P SIGMCX, 5.56 NATO, Rifle, 16in bbl, Patrol, BLK, Semi-Auto, Folding Sights, Folding Stock, (1) 30rd Alum Mag, Alum HGD, $1,866.00
RMCX-300B-16B-TFSAL-P SIGMCX, 300BLK, Rifle, 16in bbl, Patrol, BLK, Semi-Auto, Folding Sights, Folding Stock, (1) 30rd Alum Mag, Alum HGD, $1,866.00
RMCX-762R-16B-TFSAL-P SIGMCX, 7.62X39mm, Rifle, 16in bbl, Patrol, BLK, Semi-Auto, Folding Sights, Folding Stock, (1) 30rd Alum Mag, Alum HGD, $1,866.00

MCX Pistols

Part Number Description MSRP
PMCX-300B-9B-AL-PSB-CKIT SIGMCX, 300BLK, Pistol, 9in bbl, PDW, BLK, Semi-Auto, Folding Sights, Folding SBX(1) 30rd Alum Mag, Alum HGD, 5.56mm Cal-X Kit Included, Poly Hard Case $2,399.00
PMCX-9B-AL-PSB SIGMCX, 5.56 NATO, Pistol, 9in bbl, PDW, BLK, Semi-Auto, Folding Sights, Folding SBX(1) 30rd Alum Mag, Alum HGD, $2,132.00
PMCX-300B-9B-AL-PSB SIGMCX, 300BLK, Pistol, 9in bbl, PDW, BLK, Semi-Auto, Folding Sights, Folding SBX(1) 30rd Alum Mag, Alum HGD, $2,132.00
PMCX-762R-9B-AL-PSB SIGMCX, 7.62X39mm, Pistol, 9in bbl, PDW, BLK, Semi-Auto, Folding Sights, Folding SBX(1) 30rd Alum Mag, Alum HGD, $2,132.00

MCX Short Barrel Rifles (SBR's)

Part Number Description MSRP
RMCX-9B-PDW-TFSCF-SBR SIGMCX, 5.56 NATO, SBR, 9in bbl, PDW, BLK, Semi-Auto, Folding Sights, Folding Stock, (1) 30rd Alum Mag, CF HGD, $2,239.00
RMCX-9B-PDW-TFSAL-SBR SIGMCX, 5.56 NATO, SBR, 9in bbl, PDW, BLK, Semi-Auto, Folding Sights, Folding Stock, (1) 30rd Alum Mag, Alum HGD, $2,058.00
RMCX-300B-9B-PDW-TFSAL-SBR SIGMCX, 300BLK, SBR, 9in bbl, PDW, BLK, Semi-Auto, Folding Sights, Folding Stock, (1) 30rd Alum Mag, Alum HGD, $2,058.00
RMCX-762R-9B-PDW-TFSAL-SBR SIGMCX, 7.62X39mm, SBR, 9in bbl, PDW, BLK, Semi-Auto, Folding Sights, Folding Stock, (1) 30rd Alum Mag, Alum HGD, $2,058.00

Sig MCX Breakdown from Recoil

Recoil Magazine has a full breakdown of the MCX on their website. The above photo is from Recoilweb.com.

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