The Colt M4 Carbine is a semi-automatic rifle chambered in 5.56x45mm NATO. The 16.1-inch barrel is 4150 chrome moly vanadium steel with a 1:7" twist rate. Capacity is 30+1. Weight is 6.9 lbs. Finish is matte black. 
 

Key Specifications 

• UPC: 098289023537 
• Caliber: 5.56x45mm NATO 
• Action: Semi-Automatic 
• Capacity: 30+1 rounds 
• Barrel Length: 16.1 inches 
• Finish: Matte Black 
• Weight: 6.9 lbs 
   

Detailed Features 

 
The barrel is 4150 chrome moly vanadium steel with a 1:7" twist, which stabilizes heavier bullets reliably. The collapsible synthetic stock adjusts between 32" and 35.5" overall length, fitting a range of shooter builds. A single-stage trigger and manual safety are standard. Sights are an A2 front post paired with Magpul MBUS folding rear sights, which gives quick target acquisition without bulk. The platform accepts a wide range of aftermarket parts.

The Colt M4 Carbine in 5.56 NATO draws consistently positive user feedback, with reliability and build quality as the dominant themes. Owners report the rifle cycles dependably across conditions, and the 4150 CMV barrel is credited for accuracy. The matte black finish holds up well to regular use. The ergonomics are generally well-liked -- controls are easy to reach and the adjustable stock fits most shooters.

Customization comes up often in discussions; the standard AR-15 platform means a wide range of optics, grips, and furniture can be swapped in without hassle.

The main recurring criticism is price. Colt's reputation carries a cost premium over competing AR-platform manufacturers, and some buyers feel the difference isn't fully justified by the specs. Overall, the Colt M4 Carbine has a strong reputation and owners tend to be satisfied with it.