Deploying the 6.8 mm SPC 2 Cartridge

The 6.8 mm SPC cartridge was designed to improve the firepower of US special operations forces without requiring the issuing of an entirely brand new rifle. It’s one of many alternative calibers for the AR-15. While it had the backing of Remington, and was designed with the help of some active special operations forces, a number of issues have come up to get in the way of its popularity. These include (in no particular order) two different SAAMI specifications for the cartridge, more effective 5.56 mm cartridges, ready availability of 7.62x51mm carbines, a whole bunch of other important gear that’s not going to pay for itself, and the round not being a non-NATO standard has mean that it hasn’t been adopted by the organizations that worked to develop it. However, a middle eastern special forces unit has adopted the weapon as a compact carbine. Let’s take a look.

This unit contracted with LWRC for the gun, with the goal of having a very short barrel (8.5″) and plenty of firepower. Given a relatively large order of more than 30,000 carbines, LWRC decided to make some changes. To ensure reliable feeding, they worked with Magpul to design 6.8-specific magazines. These are wider than standard AR-15 magazines, and the magwell on the new guns was widened to accept them. The new magazines have that same great windowed PMAG design, hold 30 rounds, and weigh 1.32 lbs fully loaded.

Other than the aforementioned 8.5″ barrel, the rifle has a quadrail handguard, pistol-length buffer tube, PDW-length stock, and a short-stroke gas piston system. The top rail of the handguard is removable to clean or service the gas piston. The rifle is the SIX8-UCIW. A version with a longer barrel, as well as an SBR version are available for civilian purchase, though obviously without select fire capability.

LWRC also worked with ATK (the parent company of Speer) to get a round that would function well in a rather short barrel. ATK obliged with a special round that will do the job, even with military flash suppressants. And yes, it’s SPC II spec.

Ok, what do we think? Well, it’s a solid execution of the “PDW” concept for a protective detail rather than for rear echelon troops. A short, relatively light package with plenty of firepower is exactly what this will deliver. I’m not a big fan of ‘nonstandard’ cartridges for general issue (who, admittedly are not expected to have super-short 8.5″ barrels), but I like the thought process here. Another tool in the toolbox, and one that fills a useful niche at that.

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