treat16 inch 1:7 twist BA hbar barrel. Midlength gas. Lantac coated gas tube. NBS upper receiver. Magpul Moe sl handguard. Bcm qd mount and Magpul sling swivel. Matech rear sight. No muzzle device. The one pictured sold separately and does not come with this upper. It will come with a thread protector. The barrel nut has been torqued to 40ftlbs and timed properly for the gas tube. Ran one magazine through the upper and it works flawlessly and smoothly.
