The Colt M4 Carbine in 7.62x39mm is a semi-automatic rifle with a 16.1-inch barrel, 30-round capacity, and matte black finish. It weighs 6.9 lbs. Sights include an A2 front sight and Magpul MBUS rear sight. 
 

Key Specifications 

• Model: M4 Carbine 
• Caliber: 7.62x39mm 
• Action: Semi-Automatic 
• Barrel Length: 16.1 inches 
• Capacity: 30 rounds (includes 1 magazine) 
• Weight: 6.9 lbs. 
• Finish: Matte Black 
   

Detailed Features 

The 7.62x39mm chambering is unusual for an M4-pattern rifle, which is typically associated with 5.56. The A2 front sight is a mil-spec fixed post. The Magpul MBUS rear sight folds flat and is adjustable for windage. The semi-automatic action allows follow-up shots without manual cycling. 
 

Usage 

The 7.62x39mm chambering makes this rifle compatible with a widely available and affordable cartridge. It delivers more energy at short range than 5.56, though with a different trajectory and ballistic profile. Buyers who want the M4 form factor with 7.62x39 ammunition are the specific audience for this configuration.

The Colt M4 Carbine in 7.62x39mm gets attention largely because the combination is uncommon -- Colt's reputation and the M4 platform are closely associated with 5.56, so the 7.62x39 version draws shooters who want that caliber in a familiar AR-style package.

Build quality is consistently praised, which is expected given Colt's manufacturing standards. The semi-auto action is reported as smooth and reliable with standard 7.62x39 ammunition. The weight at 6.9 lbs is reasonable for the platform.

Critical points center on the caliber choice itself -- some AR shooters prefer to stay with 5.56 for parts and magazine compatibility, and note that aftermarket support for the 7.62x39 variant is narrower. The price compared to similar 7.62x39 AR-pattern rifles from other manufacturers comes up in buying discussions.