Parts Manufacturers : Trijicon

Trijicon are producing night (tritium) sights for your pistols. Proven to give shooters five times greater night fire accuracy with the same speed as instinctive shooting, Trijicon Night Sights are made tough to deliver accurately year after year. Night Sights are a unique construction using a Tritium lamp cushioned by silicon inside an aluminum cylinder, then faced with a polished Sapphire window to enhance the lamp and protect it from outside elements. The cylinder is mounted into the precision machined body and ready for use. Fully warranted for up to 12 years.

I've Trijicon sights on my Bigmouth, and I just love them, the brightest I've seen, even the outer white ring (which is similar to a 3-white-dots sight picture) is perfectly round, in contrast with some other sights I had before. Great value for your money.