Professionals who want enhanced stopping power from their duty rifle…

Professionals who want enhanced stopping power from their duty rifle will be well served with Armalite’s M-15A4 chambered in 6.8 SPC. Shown here with the Trijicon 4x ACOG.

Gun Details
ArmaLite didn’t just pick just a standard mil-spec barrel configuration for their M-15A4 6.8 SPC. The barrel is chrome-lined moly-vanadium per MIL-B-11595-E that has been double-lapped for its 16-inch length. It also incorporates an M203 step-down for its external dimension, and the barrel measures 0.75 inches at the point under the barrel. The muzzle is threaded 5/8-24 threads per inch and capped with an A2-style flash suppressor. The barrel has a 1-in-11-inch twist rate, which is ideal for bullets weighing 110 to 115 grains.

The upper and lower receivers get their strength from forged 7075-T6 aluminum alloy. The flat-top upper receiver has a Mil-Std-1913 Picatinny rail with laser engraved numbering. Nestled within the receiver is a tactical two-stage trigger. The let-off on the first stage measures 3.5 pounds and the second stage breaks at 5.5 pounds.

This carbine is fitted with a black mid-length handguard and gas system.

Standard on the M-15A4 is a 10-round magazine, although higher-capacity variants are available for those looking for added firepower.

ArmaLite introduced the mid-length gas system in the late 1990s. Part of the reason was that they found it was more reliable than the short gas system. The short gas system pushed a lot of gas for its length; a lot of people found the mid-length to be more reliable.

An appropriately matching black collapsible buttstock adjusts the length of pull from 10.38 inches to 14.5 inches. The overall length is 35.6 inches, and the rifle weighs 6.44 pounds without a magazine. The front gas block is an integral sight base configured with a Picatinny rail.

The aluminum flat-topped upper receiver features an integral strip of Picatinny rail that is machined directly into the M-15’s upper face.

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