You have to force it pal !!!
And I personal can’t quite get it in there !!
ya ‘ SSS make both the mag conversion, and the new Acme unit. The mag conversion is just a added box to the bottom for your factory box mag, The Acme unit is a very well done conversion (bottom metal & mag) unit, it fits like it was factory (Savage) made
I have seen the CDI unit and, all I can say is “GET THE ACME UNIT”
If you get one to take the 11 round, I would just remove the bottom plate, and add a ¼” peace of wood into the bottom of the mag, then you are legal !!!