The AR-15 has been dubbed “America’s Rifle” for a number of very good reasons. An estimated 20 million of them have been purchased by Americans, and while recent sales quarters have shown a dip in sales of these platforms, the AR buying is far from over.

Lightweight, extremely functional, compact and accurate, AR-15-style rifles are used by hunters, law enforcement personnel and home defenders, recreational and competitive shooters. No surprise then, that there are many, many brands of AR-15 rifle models and variations on the market today. I’ve used dozens of them, from $400 basic models to custom jobs with price tags over $3,000. 

Recently, I used one of the very best AR-15 platforms I’ve had the pleasure to shoot, the Sig Sauer MCX-SPEAR LT IR. After three separate range sessions, I concluded that the MCX-SPEAR LT might actually be the top AR-platform rifle I’ve ever used. It’s certainly among the top two or three.

Essentially a custom AR out of the box, the MCX-SPEAR LT was SUB-MOA accurate, ran flawlessly, and had a much more solid feel to it than most ARs I’ve used.

Feature Rich

The rifle is pricey. With its $2,600 MSRP, very pricey in the eyes of many firearms buyers, especially given the many AR-15s selling for under $700. I see it as a “pay once, cry once” rifle, the kind a shooter may have to dig deeper for but, in exchange, will last a lifetime plus will do everything one could expect of an AR.

Sig introduced the MCX-SPEAR rifles at the end of 2022, the civilian/consumer version of the U.S. Army’s XM7 rifle chosen for the Next Generation Squad Weapons program. Initially, the MCX-SPEAR was available in 7.62 NATO and 6.5 Creedmoor and  277 SIG Fury, with the LT model in 5.56 NATO arriving soon afterwards.

To me, the LT model represents the “little brother” or AR-15-ish version of the other SPEAR rifles, which are essentially top-end AR-10s. 

Like the original MCX rifles, the MCX-SPEAR LT operates by a short-stroke piston featuring an adjustable gas system. This piston operation doesn’t allow hot carbon fouling to rush back into the action, so the rifle runs cleaner and therefore requires less maintenance than direct-impingement ARs.

The rifle also features fully ambidextrous controls, including the bolt catch/release, the charging handle, the magazine release and the safety. The 16-inch barrel comes equipped with Sig’s Suppressor Ready QD Flash Hider, and the rifle itself is interchangeable  with all Sig MCX-LT barrels and handguards. 

Optic Choice

I mounted a Mark 5HD 2-10 FFP riflescope, manufactured by Leupold, atop the MCX-LT’s receiver.  

The Mark 5HD featured Leupold’s Tactical Milling Reticle or TMR. The TMR is Leupold’s redesign of the MIL reticle and employs hash marks instead of dots for increased ranging and holdover precision. The reticle provides aiming points for both wind and bullet drop compensation, too.

The Mark 5HD 2-10’s elevation turret provided 30 MILs of adjustment in 0.1 MIL increments. Leupold’s patented ZeroLock set screw ensured the elevation dial would not move when knocked around. 

A scope needs mounting hardware, and for this review I chose the rock-solid 30mm X-SKEL Mount from Warne Scope Mounts.

Winter Wonderland

My main accuracy testing time for the MCX-LT was a morning in north-central Wisconsin, mid-December with wind and snow and 22 degrees Fahrenheit. The snow started off as a light, fine powder but quickly became a solid curtain of large, white flakes. Winds were 10 to 15 miles per hour and cutting from left to right at 90 degrees, then frequently quartering up from my left. 

None of that seemed to affect the rifle, despite snow covering the rifle and obscuring the scope’s objective lens.  

For ammunition, I ran the rifle using HOP (House of Payne) Munitions .223 Rem. loaded with a 79-grain hollow point boat tail bullet, Norma Tactical .223 firing a 55-grain full metal jacket, and Sig’s own Elite Performance Copper Hunting and its 60-grain hollow point .223 projectile.

Those rounds were delivered into the rifle’s chamber using F.A.B. 30-Round ULTIMAG G2 magazines, which worked without a problem and loaded easily.   

Once the scope was zeroed, I shot the three loads at 100 yards, placing a half dozen five-shot groups of each ammo brand. My best groups included:

--HOP, .65 and .90 inches

--Norma, .60 and .90 inches

--Sig, two at .70 inches and a 1.15-inch.

Larger groups? You bet! But I also placed enough SUB-MOAs to know the rifle itself as a precise shooter, despite whatever shivers and too-quick trigger pulls the shooter may have committed as the snow and wind washed over him.

Superior Functionality

The trigger pull measured out to 2 Pounds, 10 ounces, on average. 

Sig’s 2-Stage Matchlite Duo trigger really does give a shooter a two-stage operation. There was an initial bit of uptake and the trigger’s wall was engaged. At this point, I could hold and re-steady myself and the rifle, hold and select another target, or squeeze through for a clean, crisp break.  

Sig beveled the bottom of the handguard and my hand cradled it nicely. The stock both telescopes out and folds up for easy transport and storage. To fold the stock, push down on the metal button atop the stock hinge, and rotate the stock up against the left side of the receiver.

The magazine release, bolt catch/release and safety are “ambidextrous.” They actually worked as such, too, on either side of the rifle, with only a moderate press of the index finger or thumb.

The MCX-LT also features a forward assist, and that’s a good thing. Many AR manufacturers have abandoned the forward assist. But I don’t care how good the rifle is, the bolt on a fast-shooting AR used in often dirty environments can and will hang up. In a tactical situation, a forward assist could save a life, literally.  

The barrel is rifled at a 1:7 twist rate, which is perfect for those of us who prefer to use the heavier .223 Rem/5.56 NATO rounds requiring a faster twist for better accuracy. This includes AR deer and hog hunters.

I didn’t need to adjust the gas control but Sig machined a very generous cutout near the front of the handguard to access the gas valve, and did so on both sides of the handguard. Nice touch. 

Selling the LT

Your store has the MCX-LT in stock and on looks alone, including the FDE Cerakote, the rifle will receive attention. What now?

“The SIG SAUER MCX-SPEAR LT IR offers consumers the most advanced rifle in its class,” says Matt Rice, Sig’s brand manager for rifles and suppressors. “It is designed to meet the needs of the world’s most elite military units and currently in use with USSOCOM (United States Special Operations Command),” which oversees the special ops units of the U.S. Military’s various branches.  

Rice suggests that sales staff point out the advantages of the rifle’s short-stroke piston operating system, the lightweight, ergonomic handguard and the new push-button, folding/telescoping stock.

Don’t forget the fully ambidextrous controls, plus the anti-rotation QD swivels. With the rifle pointed in a safe direction, let customers get a feel for the SIG 2-Stage Matchlite Duo trigger. 

Mention, too, that the rifle was purpose built for suppressed use, featuring the Sig Clutch-Lok QD muzzle device/flash hider, which allows attaching a Sig suppressor by simply turning the suppressor onto the Clutch-Lok. 

For your more tactically focused customers, add that the FDE Cerakote finish on this model MCX-SPEAR is Sig’s Gen II Infrared Coating, providing reduced visibility from thermal detection while adding to the rifle’s longevity.

In Store

Sig Sauer can provide dealers with a wide assortment of point-of-sale and point-of-purchase materials, including signage, counter cards, product display cases, and end cap displays, as well as warranty and specific promotional assets. 

Sig has an expansive team of sales reps and trainers that are instrumental in helping to educate consumers and salespeople alike. They frequently conduct training sessions with counter and range staff as well as helping dealers host SIG “Try-Before-You-Buy” events.

The company also offers SIG Rewards, a program that incentivizes sales associates who effectively sell SIG products, allowing them to earn points which act as credits towards the purchase of SIG items.  

Dealers

Sig products are available through buy groups, distributors and direct to dealer. 

For information on becoming an authorized Sig Sauer Dealer, Sig encourages interested parties to speak with their local sales representative. Sales rep and additional information is at www.sigsauer.com/suppliers.

More LTs 

This rifle is not the only Sig Sauer MCX-LT option. The gun maker also offers the MCX-SPEAR LT without the IR finish in a 5.56. NATO and 7.62x39 rifles, in SBR and Pistol configurations in the same two calibers, and in .300 Blackout as an SBR and Pistol.

Many options, which will lead to many happy customers.