Optimize the performance of your LaserMax Guide Rod Laser sight by installing a fresh set of batteries at least once a year. Reliable, lightweight and powerful, LMS-3X393 Silver Oxide batteries operate flawlessly across a wide range of temperatures, feature a 5 year shelf life and are sleeved to enable quick and trouble-free installation. The batteries for guide rod lasers that fit Glock 17/17L/19-24/31/32/34/35/37/38 with sn# prefix "AAA", "BBB", "GGG", "4A", "4B", "4G" or "5B"; and Springfield Armory XD (excluding 3" sub-compact and 4" .45 ACP).