I have a Rock River Arms M4 flattop upper for sale. I purchased this from Ed at Gunsmoke Enterprises earlier this year. The upper has approx. 300 rounds through it. Properly cleaned and maintained. I am pretty sure the barrel is DPMS M4 contour at 14.5 inches with a GSE muzzle brake permanently attached to bring it up to 16 inches. This barrel is NOT chrome lined. There are no handguards with this upper. I sold my SIR a while back, so no handguards included. The upper includes an ARMS #40 BUIS and an Ashley Outdoors front Trijicon post with white outline. Also has bolt, carrier, etc. There is the normal wear from handling and mounting optics, but in excellent condition. It has been to the range 2 times, properly cleaned and put in the safe. I am asking $450 shipped for the entire setup or $370 for the upper without the ARMS. I accept paypal (+2%) and money orders. e-mail me with any questions. Thanks.
I would only consider selling the ARMS #40 by itself if the upper sells and the buyer does not want the #40.
Here are links to the pics. They are a bit large, but want you to see what you are getting...