Premium 5.56 Nato Complete Upper Build.This upper features a carbine length gas system with an adjustable gas block. Ideal suppressor ready system.-10.5" Stainless Steel Barrel M4, made from 416R Stainless Steel. Chambered in 5.56 Nato Caliber, Midlength gas system, 1:8 twist rate.Fully inspected barrel guarentee 1" MOA @ 100yards. Inspected with CMMs and Air Guages.- 7075T6 Billet Aluminum PAMAX Upper Reciever.- 9.89" Billet Aluminum MLok Handguard.-Billet Aluminum Extended Charging Handle.- Milspec Tear-Drop Forward Assist - .750 Adjustable Milspec Gas Block - Milspec Stainless Gas Tube-Space Rifle Clear Polymer Dust Cover- BCG NOT INCLUDEDEvery complete upper reciever sold is custom made and fine tuned to each caliber. Each upper is test fired prior to shipment.