I will share my experience with the 3622. Unfortunately I will be watching four of my grand children, all under six years old for the next few days. Not conducive to airgun testing and tuning. It may be a few days till I can tell anything. Right now, cans at 25 yards aren't a problem. It's that 1/2 or even 3/4 " group I haven't achieved. When push comes to shove, I test pellets from a good bench rest using a good scope. That is coming.
My question is whether the Marauder gen 1 Lothar Walther barrel is a good place to start and do I have to change the breech to use it on the 3622.In my experience LW barrels are worth every nickel when it comes to accuracy. Any decent machine shop can take measurements from the original barrel and match the new barrel to those. They can do it relatively cheaply too.
As to "older tech" in airguns... Simplicity makes for simpler repairs.
Cheers,
J~
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