Alexander Arms AR15 Standard Rifle Upper 6.5 Grendel 18 in Barrel Carbine Length 1-7.5 Twist 5/8x24 Thread Tacstar Carbon Fiber Handguard Thread. . These AR15 Upper Receivers through the professional product specialists at Alexander Arms are fashioned working with dependable and efficient components as a way to provide you with a product that will be beneficial for many years. Designed using some of the best accessible components and construction these particular AR15 Upper Receivers from the product experts at Alexander Arms can last an incredibly long time. Alexander Arms has been developing high quality merchandise for a number of years and the Alexander Arms AR15 Tactical Rifle Upper is their particular manner of demonstrating how much they are concerned. At OpticsPlanet we ensure that it is our obligation to receive the most suitable product for all your specifications and featuring the Alexander Arms AR15 Tactical Rifle Upper is something that we're delighted to offer. Specifications for Alexander Arms AR15 Tactical Rifle Upper: Manufacturer: Alexander Arms Caliber: 6.5mm Grendel Barrel Length: 18 in Gas System Length: Carbine Length Barrel Twist Rate: 1-7.5 Threads per Inch: 5/8x24 Muzzle Device: Thread Protector Finish: Stainless Color: Black Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Weight: 3.85 lb Included Accessories: One 10-Round Magazine Magazine Included: Yes Package Contents: Alexander Arms AR15 Tactical Rifle Upper What firearm models does the manufacturer say Alexander Arms AR15 Tactical Rifle Upper is compatible with? The manufacturer says that Alexander Arms AR15 Tactical Rifle Upper is compatible with AR-15Alexander Arms UHU-65-BL: AR15 Standard Rifle Upper 6.5 Grendel 18 in Barrel Carbine Length 1-7.5 Twist 5/8x24 Thread Tacstar Carbon Fiber Handguard Thread Protector Black