The SU16E gives you a gas piston operated, 5.56 rifle with adjustable sights, a threaded 16a ^2 barrel, and proprietary compact forend. All of that comes in at under 5lbs unloaded! Gas Piston Operated, Semi Auto Rifle. Accepts AR-15 Style Magazines. Integrated Picatinny Rail On Top Of The Receiver To Mount Optics. Collapsible Buttstock. PRODUCT SPECIFICATION Brand Kel-Tec Category Long Guns Sub-Category Long Guns - Semi Auto Product Family SU16 Series Model SU16E Green Action Type Semi-Auto Caliber/Gauge - Firearms .223 Rem Frame/Receiver Finish OD Green Barrel Length - Firearms 16.000" Stock/Grip Material Polymer Stock/Grip Finish OD Green Magazine Capacity - Firearms 10 Manual Safety Y/N Yes Hand Orientation - Firearms Right Rail Mount Type Picatinny TECHNICAL SPECIFICATION Barrel Finish Matte Black Sights Fixed Front / Adjustable Rear Stock/Grip Type Collapsible Special Features Picatinny Forend Additional Information Threaded Barrel Unit of Measure Each Frame/Receiver Material Zytel Glass Polymer Barrel Material Alloy Steel Rate of Twist 1:7 Overall Length 35.50 in Overall Weight 4.70 lbs