Maybe I'll try to park the pinion assembly without blasting it. If it doesn't take to my satisfaction I'll blast and repeat. But I'll not take it apart.

Why NOT reparkerize a mixmaster with a criterion? I parkerized a Mossberg 20 gage bolt action shotgun. When one does it themselves there is little reason to not park a kit built rifle. In fact, I'd probably only park it because it's a mixmaster kit. If it was original I'd leave it alone.

My criterion is not in the white but I'm wondering if it's park or black oxide. I'll likely leave it alone. Whatever it is it's certainly dark enough. I'm not all fussy about every piece matching in color.