One of Ferdinand von Mannlicher’s very last firearms was an experimental 1901/04 carbine, scaled up from its original pistol cartridge to a new 7.63x32mm intermediate-sized cartridge. I had a video on one of these very scarce carbines from a previous Julia auction, and also took a bunch of detailed photos of the gun disassembled. Mechanically, the gun is an evolution of his 1896/1901 automatic pistol and the 1901 carbine made from that pistol. It locks using a short recoil action and a pivoting locking block, not terribly unlike the C96 Mauser pistol. One of the shortcomings of the 1901 carbine was that the handguard was fixed to the recoiling barrel, so that a firm grip on the handguard would cause the gun to malfunction. The 1901/04 variant of the carbine fixed that issue by connecting the front handguard to the trigger frame, which did not move during cycling.
Here are the photos: