Trigger jobs on .22 caliber handguns are tricky business--as evidenced by S&W refusal to do the work. Good luck with your project. Post a range report and a description of the work done when you finally get to shoot it. FWIW--my current production 617's trigger is un-modified, but seems to be getting better with use.

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'Nam 1968-69.DAV,VFW,NRA Inst.