April 5th, 2018

Old Meets New — Modern Modular Chassis for Swiss K31

Sureshot Armament group SAG K31 modular tactical chassis

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.

Sureshot Armament group SAG K31 modular tactical chassis

Sureshot Armament group SAG K31 modular tactical chassis

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)

Sureshot Armament group SAG K31 modular tactical chassis

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).

Sureshot Armament group SAG K31 modular tactical chassis
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.

Permalink Gunsmithing, New Product, Tactical 10 Comments »
January 3rd, 2017

New Bergara B14 HMR Rifle in 6.5 Creedmoor and .308 Win

Bergara HMR rifle PRS production class 6.5 Creedmoor .308 Winchester

Bergera Rifles has introduced a new rifle designed for the tactical, PRS, and long-range hunting markets. Bergara’s new B14 Series Hunting and Match Rifle (HMR) features an ergonomic, adjustable stock fitted with an internal aluminum sub-chassis. Initially, the HMR will be offered in 6.5 Creedmoor and .308 Win chamberings, fed with AICS-compatible box magazines. We’re pleased that all HMRs are guaranteed to produce sub-MOA groups at 100 yards using factory match-grade ammunition. Weight, without optics, is 9.15 lbs, about one pound less than the Ruger Precision Rifle. MSRP is $1,150.00.

The Spanish-made HMR boasts a molded synthetic stock with built-in machined aluminum mini-chassis. This mini-chassis allows secure, repeatable bedding for Bergara’s B14 action, which features two-lug bolt wtih coned bolt-head. The Chrome-Moly Bergara barrels are threaded 5/8″ x 24 at the muzzle for brakes or suppressors. The HMR uses a precision-machined bottom metal and is designed to accept AICS-style magazines.

Bergara HMR rifle PRS production class 6.5 Creedmoor .308 Winchester

The stock has a multi-stage textured finish, which looks good. Designed for both righties and lefties, the ambidextrous stock features an adjustable cheekpiece, and length of pull is adjustable with simple spacers. For slings and accessories, the HMR stock offers multiple flush cup QD mounts as well as multiple swivel studs for bipods and/or slings.

Bergara HMR rifle PRS production class 6.5 Creedmoor .308 Winchester

This should be an interesting addition to the line-up of factory rifles suitable for the PRS Series Production Class. But frankly, we think Bergara went too short with the barrels (or at least should offer longer barrels as options). In 6.5 Creedmoor, at 22″ you’re giving up 90 FPS or so compared to a 27″ (See Barrel Cut-Down Test). Additionally, we think most PRS competitors would prefer a different profile on the fore-end. Nonetheless for tactical guys who don’t like modular metal stocks, this is an interesting (and pretty affordable) new offering.

Bergara B14 HMR Rifle Specifications:

Chamberings: 6.5 Creedmoor and .308 Winchester
Action Type: 2-lug action, sliding plate extractor, cone bolt nose and breech
Magazine: AICS style mag compatible – Includes one Magpul® PMAG AICS Magazine
Barrel Specs: 6.5 Creedmoor (1:8″ Twist, 22″); .308 Win (1:10″ twist; 20″)
Mini-Chassis Material: 7075 T6 aluminum
Weight without scope: 9.15 pounds
MSRP: $1,150.00

Learn more about Bergara rifles in this SHOT Show Video by the 6.5 Guys

Permalink New Product, Tactical 4 Comments »