XS SIGHTS DXT2 Big Dot Tritium Front and Rear Night Sight for Glock 42, 43, 43X, and 48 (Yellow)The XS SIGHTS DXT2 Big Dot Tritium Night Sight is compatible with Glock 42, 43, 43X, and 48 models, including MOS versions and all generations. It features a tritium front and tritium rear set with a yellow front sight. Easy Alignment The Big Dot lets you quickly find your i sight without distractions in stressful situations, making it easier to acquire, align, and aim at targets in any lighting condition. It also helps the aim of those with aging