For Sale: Windham Weaponry R16M4 AR15 5.56/.223 Rifle Price: $ 800 Seller: Private Party Account: Unregistered Listings by this user Listed On: Wednesday, January 08, 2014 Listed In: Rifles Location: Collinsville, IL, Southern Illinois, Illinois - Map Manufacturer: Windham Weaponry Caliber: 223/5.56 NATO Action: Semi-automatic Firearm Type: Rifle Flag | Scam Spam/Inappropriate Over-priced Miscategorized Dealer Listing Unresponsive Report illegal firearms activity to 1-800-ATF-GUNS or your local police department. Edit | Favorite Windham Weaponry R16M4 AR15 5.56/.223 Rifle. Barely used. I've shot about three magazine through it just to sight it in. Iron sights only with carrying handle.