XS Sight Systems XS Big Dot Tritium Express Glock Large Frame Gun Sight The XS Sights DXW Big Dot are defensive night sights for encounters under any light condition. The Express rear sight features a vertical white stripe at the base of the shallow V. The front sight has a large easy-to-see white ring surrounding the tritium dot. Rounded low profile design won’t slow your draw and works with the majority of holsters on the market. Designed to directly replace the factory sights. Features:- Larger front sight improves the speed of front sight acquisition- White dot reflects light for best visibility in low light- Express Rear prevents obstruction of front sight when moving- Snag-free design for comfortable carry- Green TritiumSpecifications:- Sight Set- Fits: Glock 20/21/41 Large Frame- File to fit installation (no sight pusher tools)- Front Sight: White Big Dot with Green Tritium Center- Rear Sight: White Stripe (Non-Tritium)- Material: Blued Steel- Finish: Matte Black- Includes: Hardware Kit Not the One? More of the items you want… Take a look below!