clandestine
AR-15 Savant
Are you saying that once you put the buttstock on an 'other' PG [shotgun] that you can't put the PG back on and go back to 'other'?
I didn't say that. I said its no longer an "other" firearm once a stock is attached. You can put a pistol grip on a shotgun as long as the OAL is 26" and the barrel is 18" unless you want to go NFA. For an "other" the barrel can be any length as long as the OAL is 26"+ unless you want to go NFA.
Shotguns are also 18+ for FFL purchase where Other Firearms are 21+ from a FFL.