Sold pending funds."M4" above gas tube hole. Alcoa Foundry mark. 1 in 7 twist, stepdown, A2 flash hider, bayonet lug, and "09/02" date code on the 16" barrel. Comes complete with carry handle, charging handle, and complete bolt/carrier assembly. Looks like new with very few rounds through it. $900 new. I am looking for $750. Please let me know. Thank you for looking.