The Meprolight USA MPO Backup Sights, model 10224317101-MPL, are designed to co-witness with Mepro Pistol Optics, featuring a tritium-illuminated front sight and a serrated rear sight. These combat-proven self-illuminated night sights enable rapid instinctive aiming in both day and night conditions. The highly durable metal construction ensures long-lasting performance, making these sights an essential upgrade for any Glock standard frame pistol. Meprolight USA Meprolight Glock, MPO-DS Backup Sights, H-Front 5mm / Rear 7.5mm 10224317101