So the front clip/spring was to accommodate the larger diameter cartridge and memory says went to holding 4 only. The larger diameter interferes with the internal rotor spring. One could design a drop in rotor that could still use the screw but would need to think differently than the savage r&d dept.

With 3 d printers may be doable?

Your 410 rotor must be very close to the internal spring?

Edit to add finally got over for the birds eye schutzen the Covid was going around there so I stayed away. That critter is amazing! Thank You.

Last edited by ctw; 01/15/22.
What you have done is not nearly as important as how you have done it!!!
The Old Fart 2008 A.D.