Flat Top Upper Receiver. Fully Assembled, with round forward assist, ejection port cover, and T-Markings laser etched into receiver. This receiver has the M4 feedramps machined in. This is to be used with barrels that include the M4 barrel extension. Milspec Hard Coat Anodizing. Manufactured by USGI Contractor. Machined from 7075 T6 Forgings Mil-Std- 1913 Rail for mounting optics and accessories $85 shipped. USPS money order, Paypal, or Gunpal. Shipping insurance is extra. Please send email or PM.