While the SIG MCX kinda looks like a standard AR-15, there’s one major difference: it’s gas piston operated. Unlike the MPX, for example, the MCX’s upper and lower receiver are precisely mated. It’s well made too - like the rest of the gun. I don’t know of a more effortless design. Once unscrewed the barrel slides right out. With the hand guard removed, you lock the bolt to the rear and unscrew two hex screws on the side of the chamber. The set-up also means they can be a tiny bit wobbly, but the integrated Picatinny rail on the upper receiver’ s top extends out to the gas block to provide a solid mounting platform for optics.īarrel changes are easier than coming-up with a metaphor for something easy. Pull out the front takedown pin and slide the guards off the front of the gun - done. Those seeking quick barrel changes or access to the gas system for maintenance will be pleased to discover that the guards detach more quickly than a lectured teenager. For those who want the proper MCX experience they’re roomy enough to slide a silencer underneath. The guards extend about 12 inches on the barrel for a good length of pull. The hand guard is a lightweight skeletonized keymod affair. If you don’t have a SIG Sauer silencer or compatible device, no worries - the design works with all existing 90 degree shoulder mounting devices. A silencer that doesn’t stay put will have an enormous impact on a firearm’s accuracy. It gives their silencers a better grip on the muzzle, helping the can stay tight on the rifle – rather than walking off and getting into trouble (ballistically speaking). The muzzle is threaded in SIG Sauer’s nifty taper design ( drawings available here). When it comes to getting shots on multiple targets quickly – especially when shooting with a silencer attached – an MCX-wielding rifleman will have a distinct advantage. The gun also has excellent balance, which makes it incredibly easy to maneuver. The weight savings is significant unloaded, it tips the sales at a scant six pounds. The rifle sports a pencil profile (a.k.a., superlight) barrel (this version in 5.56 NATO). My biggest concern: would SIG translate the mil spec masterpiece into a useful civilian semi-auto rifle? They certainly started on the right foot.
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