Re:HD dimples. Gunsmithing, like politics and sausage making are best NOT viewed in public.
Re:Pistol grip/folding stocks on shotguns. It IS much more difficult to control AND followup shots are a screaming b****. As a smith and a NRA Firearms instructor, I have tried them all. MY 590's both are full stocked and I can hit most targets immediately and follow up shots are a snap.