Anyone able to identify this .22? The barrel says "Premier Single Shot" across the top of the barrel and " 22 Short Long and Long Rifle " on the barrel under the rear sight. No other markings whatsoever. This was my grandfather's gun. My father said he only saw this gun 1 time in his life when he was a kid in the 1960's. He shot it 1 time at a rock, which he blew up and then never saw the gun again until My Grandpa passed away in 2003. Just curious on what this thing is. Any help is appreciated!