I have a 16" Rock River Stainless steel barrel for sale. It comes with a brake. It is Rock Rivers predator series barrel. I traded for the upper from a friend who used it for hunting but wanted a light weight upper for a home defense gun since he no longer hunts. I shot the rifle with Black Hills ammo and it shoots .7 to 1" 5 shot groups. Not sure how many rounds it has through it I would guess around 500 knowing the gentleman who owns it. He is 76 now so I don't think he shot it a lot. If anyone is interested I would take $125 shipped in the US. Thanks guys!!!!