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Tests during low light and nighttime shooting have shown that sights equipped with glowing dots are more accurate and easy to see compared to using standard black sights for instinctive shooting. Traser®-branded, heavy-duty tritium lamps with a 3-Dot design serve as their energy source and remain long-lasting. These lamps are placed inside metal cylinders that are silicone-sealed to provide the most protection against breakage or leakage. Sapphire crystal windows being polished will give a brightly illuminated, perfectly round aiming dot in low light. The sapphires have white rings inlaid around them giving the sight a classic white-dot look during daylight. However, very narrow blades do not have white rings and will appear like plain black blades during daylight. Most models can be mounted in factory dovetail or sight bases. However, tenon staked 1911 models require Trijicon installation tools to prevent sight damage.