Czechpoint, Inc. and Tomas Quis filed suit against Century Arms of Vermont, Inc. and two related entities, Century International Arms of Vermont, Inc. and Century International Arms Corp., alleging infringement of U.S. Patent No. 7,676,974. The patent covers a modified automatic rifle, such as a Czech Sa vz. 58, for semi-automatic use. The case was filed in the U.S. District Court for the Eastern District of Tennessee, and is case no. 3:11-cv-00298, filed on June 27, 2011.