I have endeavored to mount my Witness Hunter 6" 10mm with a Short Tach Sight STS... The Tangfoglio advertised mount is a bridge w/ weaver rail with 4 pre-drilled holes on each side spaced at 1mm apart... It was 3 times longer than the Burris sight... Problem is, it overhung the ejection port... I reinstalled it using only the right half of the 2 part full bridge (left side being much shorter).. It works, (but to say the least, this is a poor fit)...I looked elswhere, and found a Arredondo J. Point Doctor Sight Pistol Mount that looks to be the answer.. HOWEVER.. Here again I am without complete info from the manufacturer ie: NO DIMENTIONS, USER FEEDBACK, or an eMail address to consult with the supplier as to its fit and/or usability... OUCH!!!!