Late reply to all, but very thankful for all, nonetheless. I will get the Turkey-based company who made this thing and reply...maybe they can indeed help. To date, I've shot a variety of rounds thru it; a really sweet shotgun. To the banter about pistol grips....it is indeed my personal preference for pistol grips, born of many a day with an AR-15 kinda thing. Even my deer rifle is a REM 700 in .30-06 dropped into a BlackHawk Axiom stock.
Mr. Fuller...great advice on areas to research the feasability of this; much thanks; and yup, no tang safety on this mossberg (variant).
With gentlemanly intent to PabloJ who provided " Tactical pistol grip stock on shotgun is worth warm pitcher of spit. Except for being easier to be disarmed from ones gun (really BAD THING) it serves no useful purpose."....please consider my opposing position, as I've considered yours. I do fly BlackHawks...but I have commanded US Special Forces, in combat, as recently as 2011; consider that I might know the basics of this matter. Moreover, I assert that your assertion about a pistol grip being easier to disarm to be rank, gross conjecture and born of zero living color experience...and to further assert that the grip provides no use purpose....man, I can't even help you when you're that far out.
I'll reply with the company when I can get back home.