That’s comparing figi apples to granny smith apples.

The McMillian stock has no adjustability other then adding spacers to adjust the LOP.

Other small differences -

It is the old style with the bolt release on the top, I think the bolt release on the bottom looks 1000% better

It has no compensator, not a big deal unless you want to add a can, in which case you have to pay the get the barrel threaded