Originally Posted by
psalms144.1
I would strip the frame completely, if for no other reason than to simplify clean up when you're done de-trenching. There's going to be a measurable amount of polymer "dust" or shavings floating around - I wouldn't want to get that crap into the guts of the pistol permanently.
It'll also clear the work area for you so you don't have to worry about unintentionally hitting the trigger/magazine release/etc while doing your work.
I know HK detail strip is a PITA, but I'd definitely do it.