Caliber: 5.56x45MM - Capacity 30 + 1 - Upper Rec. Material: 7075-T6 Aluminum - Upper Rec. Finish: Black Hardcoat Anodized - Lower Rec. Material: 7075-T6 Aluminum - Lower Rec. Finish: Black Hardcoat Anodized - Barrel Material: 4150 CMV - Front Sight: None Included - Barrel Finish: Manganese Phosphate - Rear Sight: None Included - Barrel Technical: 1:7RH 6 Groove Chrome Lined - Fire Mode: Semi-Automatic - Barrel Length: 16.1 in. - Trigger Type: Single Stage - Overall Length: 32-35.5 in. (81-90cm) - Grip: Government A2 Grip - Unloaded Weight: 6.5lbs - Operating System: Direct Gas Impingement Carbine - Safeties: Reversible Safety Selector - Included Accessories: 30rd Magpul PMAG Magazine Manual Cable Lock - Tested in the harshest environments the Colt Trooper M4 is a modern duty-grade Colt AR-15 - M-LOK capable handguard and Flat Top Upper Receiver are ready for the addition of Optical Sights and Accessories - Lightweight extended-length Centurion Arms handguard offers modularity for mounting accessories - The Trooper M4 is the ideal platform for your next advanced MSR build