The Spirits Within - Weapons/Equipment - General Hein's Gun General Hein's Gun Sonnet (HKMF-P325) Semi-Automatic Pistol Manufactured by HKMF. Air Pressured, Recoilless Gun. Caliber: 9mm x 19 Load: 17+1 Standard Equipped with folding grip Due to the increasing size of the space force within USMF (USMF) weapons capable of firing in zero G were required. One such weapon developed under this plan was the P-335 Sonnet, which was issued to the USMF general infantry in 2039. « Back