The Trijicon Bright & Tough Night Sights feature the standard 3-Dot sight picture and can help increase the shooters accuracy when in low-light conditions. These shock resistant sights have a meatal body for housing and a silicon rubber cushion. The lamps are contained in an aluminum cylinder and each lamp has a sapphire jewel at the cap for protection and even light distribution. Compatible with Colt models: Colt Officers, Officers ACP, Compact 1991A1 (.45); and Para Ordnance P12 with stake-in front (excluding the Limited version).