I'm not totally sure....but I have a feeling the MG-Arms stocks are MPI that MG then finishes, beds, and paints, and possibly inlets.
I'll have one in the next week or so. Paid $700, with a 3-4 month turn around which included bedding of the barreled action. 20 ounce stock was $100 less.
Here's one which seems to have the pics deleted, but you might contact Reloader28 for his pics and thoughts on the stock now that he's had it for a while:
https://www.24hourcampfire.com/ubbth...s/7895631/Re_Will_a_Ruger_Mk_II_long_act
