Was really excited to have this light on my walther pdp. Had an issue with initial installation as the pin for the battery door was slightly bent and would not close properly. After many attempts, one of the plastic battery door hinges broke and I immediately contacted Surefire customer service. They really took care of me in a timely fashion and sent a replacement battery door and pin free of charge. The light worked perfectly after installing replacement parts. Could not be happier with the quality, design and customer service Surefire provides.