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The heavier spring will change your light trigger a bit. It?s just the nature of the beast. Rimfire cartridges just take a heavier spring.
I?m guessing when you manually cocked it was after it didn?t fire? If so, that?s the second strike. The first strike made a small dent, the second time hits in the exact same spot, allowing the primer to ignite.
I had an extended firing pin in my Kadet...until a weak round caused a FTF...and my chamber ended up getting peened.Use the heavier spring. They're easy to change if you don't like it for center fire.
Use a 17# hammer spring. Joe
Get three so you have some spares if you loose one. No need to talk to CGW. The factory spring is 18 lb or so. The CGW spring is probably a 13 lb spring. I've got over 50k rounds experience with a single Kadet conversion on a 75B frame with CGW internals. With a 17# spring. Get a metal pick to clean the breech face and extractor and firing pin hole every 100 rounds or so or you will start getting some light hits. Brush the chamber and bore every few hundred rounds. If the chamber gets too dirty, the casings will drag on extraction and slow the bolt down too much to catch the next round. Use light oil on the rails, not grease. Joe
I?ve gone to using Mobile 1 as my principle gun oil. It?s made to offer excellent lubricious at a variety of temperature extremes and resist breaking down under the extreme conditions of an engine. Why shouldn?t it be equally at home in a firearm? Plus there?s plenty left in the container after it?s been emptied. Win win.
Sure would like to see a pic of that new "all steel" KADET 2 on your SP-01 now that you've got it up and running