The Colt AR-15 Carbine is a semi-automatic rifle chambered in 5.56 NATO / .223 Remington, built on Colt's standard M4 platform with 7075-T6 aluminum upper and lower receivers. 
 

Key Specifications 

• Model: M4 Carbine 
• Caliber: 5.56 NATO / .223 Remington 
• Barrel Length: 16.1 inches 
• Total Length: 32 inches 
• Weight: 5.4 lbs (unloaded) 
• Capacity: 30+1 rounds (no magazine included) 
• Action Type: Semi-Auto 
• Finish: Matte Black 
• Grip Type: A2 Pistol Grip 
• Safety Feature: Lever Safety 
• Rate of Twist: 1:7 RH 
   

Detailed Features 

The upper and lower receivers are 7075-T6 aluminum — light enough to keep the total unloaded weight at 5.4 lbs while holding up to hard use. The direct gas impingement system cycles reliably across ammunition types, and the chrome-lined barrel's 1:7 twist stabilizes the full range of common 5.56 bullet weights. 
 
The rifle ships with an A2 fixed front sight and no rear sight, so the flat-top upper is open for whatever optic or iron sight the shooter prefers. 
 

Usage Scenarios 

The semi-auto action handles quick follow-up shots for home defense, and the lightweight, customizable platform works equally well for competitive shooting or range use. The .223/5.56 caliber is also suitable for small game and varmint work.

The Colt M4 gets generally positive marks for reliability — it runs in varied conditions with fewer malfunctions than many comparable rifles, and the build quality feels solid. Colt's track record adds weight to that reputation for many buyers.

Accuracy at typical engagement distances is well-regarded, and the flat-top optics-ready design is a plus for shooters who want to run their own glass.

The recurring criticisms are the price — Colt commands a premium over several competing AR-15 platforms — and the weight, which some shooters notice on extended outings. Parts availability and aftermarket compatibility also come up occasionally, though the platform is broadly compatible with standard AR-15 components. Recoil is manageable for most, but a few shooters prefer carbines with more aggressive buffer or muzzle device setups for tighter follow-up shots.

Overall, opinion breaks along familiar lines: buyers who prioritize Colt's manufacturing history and QC tend to view the price as justified; buyers focused on value see more competitive options at lower cost.