I like to throw in a heavy bullet to make sure the gun isn't finicky across the grains. For my range testing I used four different kinds of ammo: Federal 55-grain TRU Sierra, Hornady 55-grain TAP ballistic tip, Federal XM193 55-grain ball, and Black Hills 77-grain BTHP Match King. With the optic mounted and a variety of ammo by my side, I hit the range to see what the MCX can do. Only time will tell how rugged the sight is but my first impressions were very positive. The glass is clean and clear and the red dot is crisp. The true 1x magnification optic has unlimited eye relief and the 2 MOA red dot is adjustable to 12 levels of intensity, the lowest two compatible with night vision. The last thing you want to do in a hasty deployment is remember to dial up your red dot. With all my optics, I change the battery once a year just to be sure, and I leave them on all the time. SIG claims a battery life of 50,000 hours and if you do the math that is over 5 years of constant illumination. I would suggest you test your MCX thoroughly before having such faith, though, as every gun is different and they may not all be as precise. I'll have to admit, I have a hard time trusting any design that allows for the removal of the front sight but the tolerances on the MCX are so precise the rifle held zero just fine after repeatedly breaking it down and putting it back together. The front portion of the handguards incorporates a small 1913 rail segment that integrates with the main rail segment on the upper receiver and provides the mounting point for the folding front iron sight. Removal is a breeze just pull the front pivot pin and slide the guards off the front of the gun. I actually preferred the longer of the two and didn't notice the extra couple of ounces. The smaller one offers weight savings, but you're also going to give up a little real estate for mounting accessories or support hand placement. SIG actually offers this in short and long versions that come in at 8 inches and 12 inches, respectively. Shrouding the barrel on my MCX carbine is SIG's ultra-light skeletonized KeyMod rail system. ![]() That's a nice touch and proof SIG wants its guns to run for a very long time. Anytime you can replace a wear point on a gun, you've instantly extended its service life. Another great innovation found in the upper receiver is a replaceable cam path insert. The bolt and bolt carrier actually break down almost identically to those of an AR-15, once again shortening the learning curve. ![]() This not only means shortened cleaning time, but also reduces the need for lubrication. This has been the primary gripe about the AR-15 rifle for as long as it has existed and the MCX runs much cleaner. The whole assembly is controlled by two overhead recoil springs and contained entirely in the upper receiver group.Ĭleaning and disassembly is incredibly easy with most of the fouling contained to the piston and gas block. The piston drives an operating rod attached directly to the bolt group. It is adjustable for suppressed or unsuppressed configurations and easily disassembled for cleaning. The gas block is mated to the barrel and houses the piston. The MCX operates on a short-stroke piston system a design SIG has used in some of its other rifles for decades. Take a closer look, however, and you'll see they're almost nothing alike because the MCX's upper contains the majority of SIG's innovations. For those of us who shoot with our proper (left) hand this is a welcome addition.Īt first glance the MCX's upper receiver looks nearly identical to an AR-15 upper. The difference in the MCX lower is the integration of truly ambidextrous controls. In fact, you can mate a SIG MCX upper to a standard AR-15 lower, if you desire to do so. Moving on to the MCX's fire control system, we see it is very similar to that of an AR-15 rifle. ![]() My example came with the rock solid, folding skeletonized version that was both lightweight and very comfortable. SIG actually offers a few different stock options for the MCX, both folding and collapsible, and they can be easily interchanged in seconds via the vertical 1913 rail mounting point at the rear of the receiver. This eliminates the need for a buffer tube and allows the MCX to utilize a skeletonized, folding stock. The forged and machined aluminum lower receiver houses the fire control system and buttstock, although unlike the AR-15 the MCX doesn't need a buffer assembly. The 6-pound MCX rifle is similar to the AR-15 in that it is broken down into the upper and lower receiver groups. The easiest way to do that is to start with what we all know, the AR-15 platform, and tell you how the MCX has improved upon it. For those unfamiliar with the MCX, I'll try to break it down for you now.
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