I bought this to go on my M4 but then got a solid deal on a standalone launcher so I have no use for it. Only issues are the lock that keeps the tube from sliding off the front broke off so if you slide the tube all the way to the front it will slide off the rail. I also had to shave off a little less than a millimeter on the back of the barrel mount to get it to fit my rifle. The RIS adapter is untouched. I'm looking to get $50 shipped.