SIG Sauer MCX Assessment ::

Daybreak of Fashionable Sporting Rifles


SIG Sauer’s MCX design did away with the buffer tube and spring and changed it with a spring system contained in the higher receiver. (Photograph: Jeff Wooden/

For the reason that first Stoner variant of the AR-15, a buffer tube protruding from the rear of the decrease receiver has lengthy been commonplace. The buffer tube serves two functions. First, it homes the buffer and spring, that are important components of the operate of the motion. Second, it serves as the bottom construction for the buttstock of the firearm. Buttstocks are sometimes hooked up round or to the buffer tube itself, which has dominated the design of all the assorted out there buttstocks for AR-patterned rifles.

SIG Sauer MCX Spear Rifle
That new design means the MCX bolt can run with out the addition of a buffer tube/inventory as effectively. (Photograph: Jeff Wooden/

The design of the MCX migrated the buffer spring and its related {hardware} into the higher receiver. In doing so, it has modified a number of elements of the platform itself. Gone are the times of becoming your buttstock to the tube, the truth is, you don’t even want a inventory with the MCX. There are “pistol” configurations that don’t even use a buttstock.

This tubeless design makes the MCX stand out from the AR crowd, however there’s extra to this gun than simply the buttstock.

Diving Deeper Into the MCX

The MCX shares a fantastic many of components with most AR-style rifles. Magazines, triggers, and such are suitable, however there are additionally loads of variations. The bolt provider within the MCX is pushed ahead by a pair of springs that experience simply above the provider contained in the receiver. The charging deal with additionally sandwiches into the identical space because the recoil springs and bolt provider. 

SIG Sauer MCX Spear Rifle
The decrease receiver stays similar to the AR design, even accepting AR-pattern mags. Nevertheless it additionally brings an additional journal launch on the left aspect and a small spring plunder behind the set off that seems to cut back the play between the higher and decrease receiver. (Photograph: Jeff Wooden/

The handguard is hooked up to the higher receiver and incorporates a very skeletonized KeyMod attachment part. Newer fashions even have M-Lok-compatible handguards. There’s a small window within the entrance of the handguard to entry the two-position fuel valve.

The decrease receiver is similar to conventional AR lowers besides the place the buttstock attaches. Moreover, it options an additional journal launch on the left aspect of the receiver. There’s additionally a small spring plunger mounted behind the set off that seems to be an accurizing add-on to cut back the play between higher and decrease receivers. 

The buttstock itself is a skeletonized design with a built-in folding hinge, permitting the inventory to be stowed to the aspect of the rifle. This, after all, doesn’t have an effect on the operation of the rifle. All of the mechanics of the working system are contained inside the receivers, so the rifle can fireplace whatever the inventory place.

Vary Time

SIG Sauer MCX Spear Rifle
Hitting the vary, the gun handles recoil simply, and the three-pronged flash hider works effectively. (Photograph: Jeff Wooden/

As quickly as I may, I ready the MCX for the vary. I mounted up a contemporary Tango MSR scope, additionally from SIG Sauer. The 1-8x energy scope could be a superb complement to the MCX. I then grabbed a suppressor as a result of I wished to see how the rifle functioned suppressed. I packed up some PMC X-Tac 55-grain ball ammo to shoot within the rifle in addition to a Magpul MS4 sling. Lastly, I added a few assorted PMags and GI magazines to attempt within the rifle.

After bore sighting the scope, I cracked off the primary few rounds, they usually had been fairly near my level of purpose. It solely took minor changes to get the scope zeroed, after which it was go time. Capturing the rifle at 100 yards, I rapidly gained familiarity with each the rifle and scope. Hits got here simply because the MCX churned away easily. The load felt surprisingly mild. I consider they had been marketed at 6 kilos, although I feel that could be a little below what this one weighed bare.

SIG Sauer MCX Spear Rifle
The rifle additionally feels mild within the hand and wields effectively. (Photograph: Jeff Wooden/

The three-pronged flash hider appeared very efficient at lowering muzzle flash, and the recoil of the 5.56 cartridge could be very simple to deal with in a rifle this dimension. The rifle was very snug in maneuvering and made for a really gratifying time capturing. I stretched the rifle out to the 300-yard line, the place I discovered it to be nonetheless fairly correct. I think about a questioning coyote which may have wandered into vary would have been simply dispatched. Each PMags and GI metallic mags functioned flawlessly, as I might anticipate from this rifle. 

Going Quiet


SIG Sauer MCX Spear Rifle

It felt notably good when working a suppressor, which allowed me to not solely hear my hits on metal targets however see them as effectively at longer ranges. (Photograph: Jeff Wooden/

After having some enjoyable with the rifle in loud mode, I figured it was time to put in my suppressor to see how the rifle carried out suppressed. This required eradicating the manufacturing unit flash hider and putting in my suppressor mount. SIG makes use of a taper on lots of its muzzle gadgets to help in alignment, since I wasn’t utilizing a SIG suppressor, the taper was unneeded. I mounted up my Yankee Hill Machine Turbo 5.56 suppressor and went proper again to city on the targets.

Suppressed capturing made the MCX actually shine. The elevated weight appeared to relax the recoil impulse even additional, making it simple sufficient to identify my very own hits at 200 yards. The lowered noise is at all times welcome, and listening to metal targets ring with out listening to safety is at all times higher.


Target SIG Sauer MCX Spear Rifle
Beneath higher situations, the gun ought to present even higher teams. (Photograph: Jeff Wooden/

Accuracy proven right here from the MCX wasn’t spectacular, however I can actually clarify that. The included image exhibits 5 pictures from 55-grain PMC X-Tac ammunition. It shot a lot better with Hornady Black 75-grain match, however I didn’t get it on paper. Capturing from baggage at 100 yards with an eight-power scope whereas shivering in beneath freezing temps could not have given the MCX a good shake.

Execs & Cons

SIG Sauer MCX Review :: is written by for

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