Best Tune Kit For the AA Pro-Sport?

OTHER ..... keeping the OEM spring & if a .177 replacing top hat with a lighter one.

Manufacturing a custom fit Acetal spring guide for the OEM spring & tighter latch rod clearance.

Check or correct piston seal fit while also perhaps manufacturing tighter fitting wear rings for the piston.



THAT IS TUNING ... drop in kits while working fine for most are a drop in short cut and only really reduce spring noise & some of the cyclic vibration.