The Umarex Browning Buck Mark URK is a .177 caliber break barrel spring piston replica of the 22LR Browning Buck Mark. It is a pretty close copy in most respects. The Umarex URX incorporates good usage of metal and plastic and is very accurate once you master the slightly heavy trigger on it. The Buck Mark URX is a single shot target pistol with an easy cocking effort, yet yields above 300 fps performance with standard lead pellets.