Barrett M468

Lore & Background

The Barrett M468 was developed as an attempt to create an optimal Special Operations close-to-medium range carbine for Close Quarter Battle (CQB). Two versions were produced: a 12-inch barreled micro-carbine and a 16-inch barreled carbine. The standard M468 used a regular forend, while the M468A1 featured an ARMS Selective Integrated Rail (SIR) accessory rail system with integral flat-top Picatinny Rail scope mount, a 4-position forend, and a detachable ARMS Back Up Iron Sight folding rear iron sight. The Barrett gas block included an integral forward-folding iron front sight. The rifle could use either a solid M16A2-style stock or an optional M4-style 4-position collapsible stock, along with an M16A2-style pistol grip.

The original muzzle brake was a proprietary design with four vents (two on each side) for increased control, later replaced with an M16A2-style birdcage muzzle-brake on the later Barrett REC-7 for compatibility with standard rifle grenades and silencers. A proprietary Barrett-made silencer was available, optimized for the 12-inch barreled version, weighing 1 pound and measuring 12 inches long. The Barrett gas block contained a ratchet that steadied the suppressor while mounted, which screwed on clockwise and unscrewed counter-clockwise.

The M468 could not use standard AR-15/M16 magazines, so Barrett designed their own steel magazines with a steel follower and two magazine springs for reliable feeding. The original 28-round magazine matched the dimensions and web gear of 30-round AR-15/M16 magazines. Larger 30-round Barrett steel magazines were one inch longer and weighed 5 oz more empty (1.82 lb full). Precision Reflex Inc. (PRI) made a 25-round steel magazine. The civilian-market version shipped with a soft carrying case, cleaning kit, sight wrench, and two 25-round PRI magazines.

Reader's Guide

The Barrett M468 was an attempt to improve terminal performance over the 5.56mm NATO by rechambering the M4 carbine for the 6.8mm SPC cartridge, targeting Special Operations close-to-medium range roles. However, the M468 employed the same Stoner bolt and carrier piston system as the M4, which distributes hot gases and unburnt propellant directly into the receiver, leading to overheating and potential stoppages if maintenance is overlooked. The more powerful 6.8mm cartridge exacerbated this issue, making the M468 less reliable than the M4 it sought to replace. Barrett ceased manufacturing the rifle in 2010, selling remaining stock only as upper receiver kits. The M468 was largely replaced by the upgraded Barrett REC7, which uses a short stroke piston to minimize the direct impingement system's gas-related problems. The REC7's 5.56mm NATO version was submitted for the Enhanced Carbine trials for conventional forces in 2008. The M468's legacy lies in its role as a transitional design that highlighted the limitations of the direct impingement system with a more powerful cartridge, paving the way for the piston-driven REC7.

Did You Know?

• The M468 designation stands for an M4 carbine chambered for the 6.8mm SPC cartridge.
• The original M468 muzzle brake had four vents, two on each side.
• The M468 used steel magazines with two springs instead of one.