I think it's almost imposible to know how many are actly in game as people kept them with their old stat ie not reapring them since gold and then you have been upgraded to acient status recently its imposible to to know how many are hanging around in peoples storage but save to say not many.
Guys, it was one of first looted 1/P-3s with bugged stats. Like they had same ammo consumption but decay somewhere around 130 pec. Those bugged guns got 'fixed' after 'ancient' VU 7.7 (well along with adj mkV which got bugged in that VU) and they recieved 'ancient' status after the fix too, by mistake i think.