This is a package deal including the pistol with one 30 rnd Grease Gun Mag, manual and trigger lock. The VMAC is a descendant of the famous Military Armament Corporation machine pistol manufactured in the early 1980’s. Like the MAC 10 they are made of a formed sheet metal lower receiver containing the trigger mechanism, and a square tube upper receiver, housing the barrel and bolt assembly. The barrel has a thread size of 7/8 x 9 for any accessories you may want. The magazine is well incorporated in the pistol grip. It uses the blow-back unlocked bolt design. All parts have a manganese phosphate finished IAW 184.108.40.206 of Mil-STD-171, the U. S. governments recommended protective finish for steel.