What if i purchase a M84 scope for the M1 garand?
Read this -
It covers the problem of the M84 scope and its mount. Basically, you need a modified barrel for the other half of the M84 mount. The Garand M1D's were made this way, but the typical M1 was not.
There are "offset" scope mounts available (such as the S&K) or you can non-destructively replace the rear handguard with a "scout mount" that would use a modern IER scope.
As to clip capacity and hunting regs, there are 5rd clips available for very low cost to handle that concern.