VMAC9-100 manufactured by Velocity Firearms. This is a package deal including the pistol with one MPA Polymer Sten 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 square tube upper receiver, housing the barrel and bolt assembly. The barrel is 5.4” in length and have a thread size of ¾ x 10 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 188.8.131.52 of Mil-STD-171, the U. S. governments recommended protective finish for steel.