This along with the TK strain screw dramatically improved the reliability of my 617 revolver. I went from 2 to 3 misfires/light strikes per 10 shots to 50 shots with one misfire. Very pleased.
I bought these to shoot 40s&w in my gp100 10mm. They worked but was very pick on case type and wish a relief cuts. Was almost impossible to get the spent cases out and very hard to get the round into the moon clip.
