Old Meets New — Modern Modular Chassis for Swiss K31
You’ve never seen a Swiss K31 like this before…
The Sureshot Armament Group (SAG) has developed a modular aluminum chassis for the vintage, straight-pull Swiss K31 rifle. This chassis transforms an old classic into a modern, fast-cycling tactical rig. The SAG Lightweight K31 Rifle Chassis is CNC-Machined from aluminum. Hard anodized, it weighs just 2 lbs. 13 ounces. It offers adjustable cheek piece and butt-pad, with a three-inch LOP adjustment range. Believe it or not, installing a vintage K31 into this SAG stock is an easy bolt-on process. No modification of the K31 action is required.
The chassis-builder SAG states: “The main idea behind the SAG Lightweight K31 Rifle Chassis was to give the shooter …ergonomics of a Tube-gun but with lines of the classic rifle. The chassis ‘wraps’ the shooter around the rifle, moving bolt operation under the shooters cheek to allow the marksman to maintain cheek weld during the whole shooting series.” The chassis design also allows a more forward optics placement for better eye relief.
SAG Lightweight K31 Rifle Chassis Features:
CNC-Machined Aluminum with hard-anodized matte finish
Easy bolt-on installation to Swiss K31
Adjustable Cheek Piece (0-30mm)
Adjustable Buttpad to set LOP (11.5” – 14.5”)
KEYMOD Interface on fore-end and buttstock
Accepts any AR-type pistol grip
Overall chassis weight: 2 lbs. 13 oz. (1280 grams)
Chassis MSRP: €950 ($1163.00 USD)
About Switzerland’s Original Karabiner Model 1931 (K31)
The Karabiner Model 1931 (K31) is a magazine-fed, straight-pull bolt action rifle. It was the standard issue rifle of the Swiss armed forces from 1933 until 1958, though examples remained in service into the 1970s. It has a 6-round removable magazine, and is chambered for the 7.5×55mm Swiss Gewehrpatrone 1911 cartridge (aka GP 11).
Wiki Photo by Bouterolle, CC BY-SA 3.0
Although the K31 is a straight-pull carbine broadly based on previous Swiss “Schmidt–Rubin” service rifles and carbines, the K31 was not designed by Colonel Rudolf Schmidt (1832–1898) as he was not alive in 1931 to do so. Mechanical engineer Eduard Rubin (1846–1920) was the designer of the 7.5×55mm Swiss ammunition for which previous Swiss service rifles and the K31 are chambered. The Karabiner Model 1931 was a new design by the Eidgenössische Waffenfabrik in Bern, Switzerland under Colonel Adolf Furrer (1873–1958). The Karabiner Model 1931 replaced both the Model 1911 rifle and carbine and was gradually replaced by the Stgw 57 from 1958 onwards.
