MCX SPEAR-LT 7.62X39MM 16” BBL (1)28RD MAG COYOTE
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About this product
The Ironclad Armory MCX SPEAR-LT in 7.62x39mm is a 16-inch barreled carbine engineered for enhanced reliability and modularity using the Russian intermediate cartridge. Sig Sauer’s SPEAR-LT platform represents the commercial evolution of their Next Generation Squad Weapon submission, adapted here by Ironclad Armory with specific components to maximize the performance of 7.62x39mm ammunition. This configuration ships with a single 28-round polymer magazine, finished in Coyote Brown, and is priced at a premium that reflects its duty-grade origins and proprietary operating system.
What is the Ironclad Armory MCX SPEAR-LT 7.62x39 used for?
The Ironclad Armory MCX SPEAR-LT is designed for the shooter seeking a gas-piston, folding-stock carbine for tactical training, competitive multi-gun matches, or as a robust defensive firearm. Its 7.62x39mm chambering offers superior barrier penetration and terminal performance compared to 5.56mm within 300 yards, and the folding stock allows for compact transport in a vehicle or case. The short-stroke piston system, shared with military contracts, runs cleaner and cooler than a direct impingement AR-15 during high-volume drills.
How does the MCX SPEAR-LT compare to the Stevens 334 Rifle?
The MCX SPEAR-LT is a premium, modular, semi-automatic tactical carbine, while the Stevens 334 Rifle in .308 is a budget-friendly, traditional bolt-action hunting rifle better suited for precision shots at longer distances. You get vastly faster follow-up shots and modular handguard/stock compatibility with the SPEAR-LT, but the bolt-action Stevens will deliver superior mechanical accuracy from a bipod or bench rest. The SPEAR-LT weighs 7.1 pounds unloaded, compared to the Stevens 334’s 6.8 pounds, but the former’s magazine capacity of 28 rounds vastly exceeds the latter’s internal 4+1 magazine.
What does it weigh and what are its dimensions?
The MCX SPEAR-LT 7.62x39 with its 16-inch barrel weighs 7.1 pounds (113.6 ounces) without a magazine and optics. Its overall length is 35.5 inches with the stock extended, which collapses to a minimum length of 31.2 inches and, crucially, folds down to a transport length of just 25.8 inches—a primary benefit for vehicle storage. The M-LOK handguard measures 13.5 inches in length, providing ample real estate for lights, lasers, and foregrips.
Who is this NOT for?
This rifle is not for the first-time or budget-conscious shooter, nor is it ideal for pursuing long-range steel targets beyond 400 yards with typical steel-case ammunition. At $2,645.99, its entry cost is nearly triple that of a basic AR-15 in 7.62x39mm, and the proprietary nature of the upper receiver and bolt carrier group locks you into a higher-cost ecosystem for spare parts. Stick with traditional shotguns like the Stevens 555 Sporting O/U 12 Gauge for clay targets or a standard bolt-action for hunting if minimizing expense is a priority.
What's in the box?
The rifle ships with one 28-round polymer magazine, a standard AR-style pistol grip, the folding/collapsible stock, and a multi-tool for adjusting the gas system and handguard. You will not find iron sights, a sling, a cleaning kit, or any optic mounting solution in the box. This is a bare-essential package reflective of Ironclad Armory’s focus on the rifle’s core mechanics, requiring the end user to add between $300 and $1,500+ in necessary accessories to make it field-ready.
Is the MCX SPEAR-LT worth it at $2,645.99?
The Ironclad Armory MCX SPEAR-LT 7.62x39mm is worth its price only if you value its specific combination of a folding stock, a durable short-stroke piston system, and an AR-15-compatible lower receiver interface. You are paying a $1,200 premium over a standard-built AR-47 for a militarily-proven action that suppresses easily and folds for transport, which is a tangible advantage for vehicle-based use or SBR configurations. For most general-purpose recreational shooting, that premium is difficult to justify unless you specifically need its operational features.
Specs at a glance
Pros & cons
What works
- Weighs 7.1 lbs (113.6 oz) — a 0.4 lb advantage over some piston-driven 7.62x39mm competitors like the PWS MK111 MOD 2.
- Folding stock reduces transport length to 25.8 inches — more compact than any fixed-stock AR by over 9 inches.
- 4-position adjustable gas block allows optimized function for suppressed or unsuppressed fire in under 2 minutes.
- 13.5-inch M-LOK handguard provides ample mounting space for modern accessories.
Trade-offs
- Proprietary bolt carrier group and upper receiver — replacement BCGs cost $450+ versus $150 for a standard AR.
- No iron sights included — adds a minimum of $80-$150 to the initial setup cost.
- Limited to proprietary magazines — AK-pattern mags are incompatible, locking you into a higher-cost supply chain.
- High initial price point — at $2,645.99, it requires a significant investment before adding optics, light, and sling.
Key attributes
| upc | 798681660889 |
| manufacturer | SIG SAUER |
| manufacturer part number | RMCX-762R-16B-LT |
| action | Semi-Auto |
| barrel finish | Black |
| barrel length | 16'' |
| caliber/gauge | 7.62 x 39mm |
| capacity | 28+1-Round |
| color | Coyote |
| length | 34.3'' |
| magazine included | 1 x 28-Round |
| model | MCX Spear |
| number of magazines | 1 28 rd. |
| product type | AR |
| safety | Ambi Safety |
| shipping weight | 10.45 |
| sights | Optic Ready |
| thread pattern | 5/8"-24 tpi |
Frequently asked questions
- Is it compatible with standard AR-15 lower receivers?
- No, the MCX SPEAR-LT upper receiver assembly is not compatible with a standard AR-15 lower. However, this rifle's own lower receiver is dimensionally compatible with most AR-15 grips, triggers, and safety selectors, allowing for customization of those components. You must buy complete MCX SPEAR-LT uppers and lowers as matched sets from Sig Sauer or licensed manufacturers like Ironclad Armory.
- Does it work with AK-47 magazines?
- No, this 7.62x39mm variant does not accept standard AK-pattern magazines. It is designed around Sig Sauer's proprietary polymer 28-round magazine, and aftermarket companies like Duramag produce compatible metal magazines. Attempting to modify an AK magazine to fit will not work due to the radically different magazine well geometry and feed lip angle.
- Can the gas system be adjusted for a suppressor?
- Yes, the SPEAR-LT's short-stroke piston system includes a 4-position adjustable gas block. Positions include suppressed, normal, adverse, and off (for manual cycling), allowing you to tune gas flow to reduce port pop and backpressure with a suppressor attached. Adjustment requires the included multi-tool and can be completed in under 2 minutes.
- Does this rifle ship with a threaded barrel?
- Yes, the 16-inch barrel features a standard 5/8x24 thread pattern, which is the common threading for .30 caliber muzzle devices. The threads are protected by a standard A2-style birdcage flash hider, which can be removed to install a muzzle brake, compensator, or suppressor mount. The thread length is 0.625 inches.