I have a Colt mil spec M4 barrel and Knight armament rail set up I want to sell. There is no flash hider on the barrel. It is brand new never been fired. The rails are used but all parts are present and it is in perfect working order. I would like to get $500. for the complete set up. Willing to ship. Thank you for looking. If purchased before Wednesday I will include four magazines. SDR, thanks but no.