The SIG Mondragon, one of the earliest “successful” semi-automatic rifles, employs a gas-impingement system that drives an operating rod on the right side of the receiver to cycle the bolt. The rotating bolt has four front locking lugs, that is similar in design to the much later and better known K31 rifles. It has an inverted “V” front sight, a bayonet lug under the barrel, and a military style tangent rear sight marked from “4-2000” . The receiver is unmarked except for the serial number “1804” that appears on the left side, then repeated on top of the bolt, on the later design cocking handle, and on the rear of the magazine release. The stock is marked “814” on the left side, above the magazine housing, in a manner that suggest an inventory number rather than a serial number. Typical Swiss metal buttplate.
Swiss SIG, Mondragon M1908, one of the earliest semi-automatic rifles to be adopted by any military, #1804, A-1419.
Overall VG with a replacement lever to the left of the gas system and a very tiny crack on the bolt that is only visible on disassembly. Faded blue, stock with scattered dings and staining as carefully photographed but no cracks. Bright bore with strong rifling. Perfect manual mechanics. A classic early development semi-automatic rifle, designed in Mexico, but made in Switzerland!