The MRX is not FSC even if you bought the Etrigger frame.
If you want a mech semi from spyder that is FSC just buy the MR5 not the E-MR5. the differences between the MRx and 5 are not just in the frame. The bolt, Barrel and milled chambers are also different I believe.
Or maybe I am not understanding your question
Originally Posted by CCMachinist
When I started doing shells for my revolvers the apparent thing i noticed was the hole size in the cartridge controlled the velocity of my paint.
TL;DR hole size controls how fast balls get spent