im selling my m4 it has lots of upgrades the only thing that is uppgraded that you cant see is the 9mm buffer. the rail is made by midwest indestries. there is only 100 rounds through it. i have a eotech thats brand new in the box that im selling speprate for 400 it has never been shot. model is a 553. email firstname.lastname@example.org for more info. ftf in az preferabily but will ship cust pays shipping.