The Fostech Stealth Series Raptor AR-15 Rifle. This rifle is one of the lightest, most accurate, high-quality AR-15 rifles on the market! Coming in at an amazing baseline rate of under 5.5 pounds, this rifle can be carried all day and still be tough as nails. The Raptor features the highly coveted 16" Faxon Gunner Series barrel. The rifle is chambered in 5.56 Nato and the barrel is constructed of 4150CMV steel with a 1 in 8 twist rate which is ideal for stabilization over a wide array of bullet weights. The Stealth Raptor also features Fostech's proprietary lightweight upper and lower Billet receivers, a Fostech Low Mass Nickle Boron bolt carrier group, and the highly desirable Mach-1 16" lightweight M Lok compatible rail. This rifle maintains an ultra-trim profile but has ultra-high quality features which provide amazing strength and stability making it a workhorse capable of long days on the range. Fostech designed this rifle to hold up under even the heaviest combat conditions while still being an amazing work of art that anyone would be proud to own. This model is finished in a beautiful Sniper Grey color scheme and completed with the world-famous Fostech Echo II trigger factory installed. Compatible with M Lok Attachments Billet Aluminum/Magnesium Alloy Receivers 5.5 Lbs Total Base Weight ( Unloaded ) Fostech Strake Muzzle Device Fostech Sabre Grip MFT Minimalist 6 Position Stock Flip-Up Sights Included 30 Round Mag Included Hard Case Included Owners Manual Included Warranty Cards Included