The Colt LE6920 is a semi-automatic rifle chambered in 5.56x45mm. Similar to the battle tested M4 the LE6920 features adjustable front and rear sights. The butt stock has four-positions and the barrel is 16.1 in length and chrome lined. A picatinny rail allows for the attachment of optics. Details Caliber 223 Rem 5.56 NATO - Capacity 30 1 - Upper Rec. Material 7075-T6 Aluminum - Lower Rec. Material 7075-T6 Aluminum - Upper Rec. Finish Matte Black - Lower Rec. Finish Matte Black - Barrel Material 4150 CMV - Front Sight A2 Fixed Front Sight - Rear Sight Magpul MBUS Rear Sight - Barrel Finish Manganese Phosphate - Barrel Technical 17RH 6 Groove Chrome Lined - Fire Mode Semi-Automatic - Barrel Length 16.1 in. - Trigger Type Single Stage - Overall Length 33-35.5 in. (81-90cm) - Grip Magpul MOE SL Pistol Grip - Unloaded Weight 6.9 lbs - Operating System Direct Gas Impingement - Safeties Reversable Safety Selector - Included Accessories 30rd Magpul PMAG Magazine and Vertical Grip Manual Cable Lock - The Colt LE6920MPS Magpul Series is the quickest and easiest way to get the customized rifle you want at an excellent price point - A2 Front Sight and Flat Top Upper Receiver are ready for the addition of Optical Sights or Accessories