This gun was made famous by Oswald Singer a.k.a. OZ. Very few have been produced, the exact number has never been released.
Chambered in the powerful .454 magnum with a 30mm under grenade launcher. Its like a crack of thunder in every pull of the trigger.
Two very common loads for the 30mm is grenade and shotgun rounds.
.454: 18/30/60, 2d8+1,Rof:1, cost:800, wgt:9, min st: d6, shots:6 AP3.
30mm:(grenade) 10/20/40, 3d6, SBT
30mm:(shotgun) 5/10/20, 1-3d8 min str d10 one handed, d6 two handed.