Upper Kit Features Introducing the Alexander Arms 6.5 Grendel Upper Kit! This kit has everything you need to get started on your very own 6.5 upper build! The kit includes: Mil-Spec flat top upper receiver (port door and forward assist installed) Our very own high quality 16 stainless extreme lightweight barrel with a 1:8 twist Threaded 5/8-24 TPI RH Complete bolt carrier and 6.5 Grendel Bolt .875 Gas Block Mid-length Gas tube Mil-Spec charging handle One 10 Round Magazine The kit does not include a barrel nut or handguard. Upper Kit Specifications Brand: Alexander Arms Category: Uppers Gun Platform: AR-Style Caliber: 6.5 Grendel Model: Upper Kit Barrel Length Range: 16 to 16.99 Sights: None Optic Ready Capacity: 10rd Muzzle: Threaded Firearm Fit: AR-15 Max Capacity: 10 Receiver Finish: Black Cerakote Receiver Material: Aluminum Thread Pattern: 5 / 8-24 tpi Twist: 1:8 Barrel Material: Stainless Steel Barrel Length: 16