These assemblies have been on a shelf in my shop and never opened. This M951 Surefire Model P60 Lamp Assembly is a reliable and high-quality option for anyone in need of a powerful light source. The assembly is powered by lithium batteries, ensuring long-lasting and reliable performance. The brand name SureFire speaks for itself, and this light is no exception. It is perfect for use in hunting and other outdoor activities, and is a must-have for any scope or optic enthusiast. With its easy-to-use design and durable construction, this M951 light is sure to provide reliable illumination for years to come.