A bolt catch assembly configured for operating with rimfire ammunition for use with a firearm including a receiver with an exposed receiving chamber. The rotor has a shaft portion and a vane portion that are an integral, unitary piece. The search tool includes a user interface which includes a scale, a user input element and a potential attributes area. A first angle, formed by the branch electrode in the first main region with respect to a first direction, is different from a second angle formed by the branch electrode in the second main region with respect to the first direction. Wafer level processing continues after detaching the second carrier.