I am looking recomendations for a rear sight tool for Glock .40 cals. I will be changing out sights on our dept. guns so I need one which will install a variety of diff. manu. since everyone gets thier own choice of what they want to use. It needs to be as cost effective as possible as it is coming out of my pocket. My email is PMPD07@yahoo.com or PM me here. Thanks in advance for the assist.