Just got this rifle put together and ran some rounds for barrel break-in. I started with a Pierce Engineering short action and attached Proof Research 16.5 carbon fiber barrel. Dropped the barreled action into a KRG whiskey 3 chassis. Also Attached the Timney tactical trigger which is set to about 6oz. Decided to go with Schmidt and Bender police marksman 2 in American Rifle Company m10 rings. Screwed on the Thunderbeast and attached the atlas to finish it up. I am so impressed with is Proof barrel, just during the break-in process I was getting .4-.5 inch groups at 200 yards. I love this Short Rifle.