I recently bought a consignment 625-6 in pristine condition though used. It had been highly polished by a very patient and dedicated former owner. The action was light and smooth, which led me to believe the owner performed or had done a nice action job. I bought a bunch of full moon clips and loaded 'em up prior to going to the range. Once there, it took about 100 rounds before every load of six would exhibit at least one light strike and non ignition in DA fire (no problem in SA mode). After about a dozen light strikes in as many full clip loadings, I packed up and went home.
I thoroughly cleaned the piece and then disassembled it. Guess what, folks? Besides MIM hammer and trigger (my first experience with MIM parts), it appears our former owner achieved his "smooth action" by backing off on the mainspring strain screw using some sort of goop to keep it from backing out further on its own. In addition, about 1/3 rd of the rebound spring had been summarily clipped off as well. I completely disassembled the gun inspected, cleaned and lubed the individual parts as well as polishing the bottom and back of the rebound slide (per Kuhnhausen's instructions). I left the arm disassembled and ordered a set of lighter power springs from Wolff. Got 'em yesterday and reassembled the gun. WHAT A DIFFERENCE! I'm sure the light strike problem was from the strain screw having been backed out. We'll see. The new mainspring is down tight with the strain screw all the way in and the rebound slide is sporting a longer but 13 lb spring. It cycles beautifully in both DA and SA. BTW, the MIM parts sure seem "cheezy" compared to the old style. The action seems to function well with them though.
Any thoughts on these matters?
I thoroughly cleaned the piece and then disassembled it. Guess what, folks? Besides MIM hammer and trigger (my first experience with MIM parts), it appears our former owner achieved his "smooth action" by backing off on the mainspring strain screw using some sort of goop to keep it from backing out further on its own. In addition, about 1/3 rd of the rebound spring had been summarily clipped off as well. I completely disassembled the gun inspected, cleaned and lubed the individual parts as well as polishing the bottom and back of the rebound slide (per Kuhnhausen's instructions). I left the arm disassembled and ordered a set of lighter power springs from Wolff. Got 'em yesterday and reassembled the gun. WHAT A DIFFERENCE! I'm sure the light strike problem was from the strain screw having been backed out. We'll see. The new mainspring is down tight with the strain screw all the way in and the rebound slide is sporting a longer but 13 lb spring. It cycles beautifully in both DA and SA. BTW, the MIM parts sure seem "cheezy" compared to the old style. The action seems to function well with them though.
Any thoughts on these matters?