The Alexander AR15 DIY 16″ Upper Kit in 6.5 Grendel delivers the components you need to build your own upper receiver assembly. This kit features a 16-inch steel barrel with matte black finish and a 1:8″ rate of twist, chambered for 6.5 Grendel cartridges.
Included in this package are the Grendel upper receiver, gas block, gas tube, roll pins, charging handle, and thread protector. The kit measures 20.35 inches in length, 4.60 inches in width, and 5.05 inches in height. You assemble it yourself.
