I have the 4" 617, my neighbor has the 6". We both love Ahrends retro combat grips. He had to put the rubber factory back on his 617 to deal with the muzzle weight. My 4" is perfectly balanced.

I did the Wolff spring kit and slicked up the innards. I have the Khunhausen manual and have done it a few times.

I put a Burris Fastfire red dot on mine to help the 61 yr old eyes. I'm shooting clay birds off the hill at 35 yards and breaking up the pieces. It's that good.