The Colt M4 Carbine is a semi-automatic rifle chambered in .223 Rem with a 16.1-inch chrome-moly steel barrel and an aluminum receiver. 
 

Key Specifications 

• Manufacturer: Colt 
• Model: M4 Carbine 
• Caliber: .223 Rem. 
• Barrel Length: 16.1 inches 
• Capacity: 30 rounds 
• Weight: 6.9 pounds (105.1 ounces) 
• Action Type: Semi-Automatic 
• Frame Finish: Black 
• General Material: Aluminum 
• Barrel Twist: 1:7 RH 
   

Detailed Features 

 
The chrome-moly steel barrel with a 1:7 right-hand twist stabilizes a wide range of bullet weights in .223 / 5.56. The A2 pistol grip is a standard mil-spec design. The Magpul flip-up rear sight provides quick target acquisition and is removable for when a full-length optic is preferred. The safety lever is standard AR-platform placement and operation. 
 
At 6.9 lbs it is a mid-weight carbine. The aluminum lower and upper receiver combination is standard for the M4 platform. The rifle accepts standard AR-15 magazines.

The Colt M4 generates positive feedback around reliability and build quality. Colt's reputation for consistent manufacturing runs through most owner discussions, with users noting it cycles reliably across varied ammunition. The platform's familiarity to anyone who has used an AR-15 is a practical advantage.

Accuracy at typical carbine ranges is well-regarded. The 1:7 twist barrel handles 62-grain and heavier loads well. Customization with standard AR accessories is a common topic; the platform supports the full range of AR-pattern parts.

Price comes up regularly, with some users comparing it to other AR-15 carbines at lower price points and asking whether the Colt premium is worth it. Most owners conclude the quality and resale value justify the cost. Ergonomics and handling get generally positive notes, and there is a community of Colt-specific users who share modifications and experiences online.