Selling this for a friend. This is a Trijicon TA01 ACOG. Sight was mfg'd in '98. Tritium still glows, but is a little dim. Trijicon could replace tritium, but I don't know what they would charge for that. Asking $500 with mount. When new, this sight and mount combo was about $1,200. He would also consider a trade for a Sig 228R or 229R plus some cash from him.