A Sneaky Swiss Sniper for Israel: the ZK-31

The Hammerli FK-31 is a rare, diopter-sighted competition variant of the Schmidt-Rubin K-31 rifle, originally procured by early Israeli forces around 1948. These rifles were part of a clandestine order of 200 units, officially destined for Nicaragua but diverted to Israel. The FK-31 features integrated diopter sights, a departure from standard military K-31s, and retains the K-31's reliable straight-pull bolt action and 6-round detachable magazine chambered in 7.5x55mm Swiss.

The K31 Swiss rifle is highlighted as one of the most accurate military surplus firearms. It features a distinctive straight-pull bolt action, a 6-round detachable magazine often loaded with stripper clips, and a unique ring-style safety. The rifle demonstrates excellent accuracy and rapid cycling capabilities during live fire.

The Swiss ZfK-55 sniper rifle, adopted in 1955, was a purpose-built precision rifle based on the K31 action. It features significant mechanical upgrades including a heavy barrel, muzzle brake, semi-pistol grip, and an integrated bipod. A unique 15-degree clockwise rotation of the action allows for stripper clip use with a center-mounted scope, a 3.5x Kern optic being standard. Despite its quality, the rifle's 13.5 lb weight and non-locking bipod present some drawbacks.

The Swiss ZfK-55 sniper rifle, a modification of the K31, was produced from 1956-1959 and adopted by the Swiss military for 800-yard engagements. Key features include a canted action for scope clearance, a bipod attached to the receiver, a factory-added pistol grip, and a heavier barrel. It was equipped with a 3.5x Kern scope.

This review explores the accuracy potential of the Swiss K31 rifle, particularly when equipped with diopter sights. Despite challenging weather conditions, the rifle demonstrated impressive accuracy, achieving a 3-inch group at 300 yards. The video also touches on the importance of proper rifle bedding, the cost of high-quality diopter sights, and the unique safety mechanism of the K31.

This review delves into the Swiss Model 1911 Infantry Rifle, highlighting its historical significance as the 'grandfather' of the K31. Key differences in bolt design, including rear-locking lugs and a longer assembly, are detailed. The video showcases the rifle's walnut stock, distinct charging arm, and operational aspects like loading with stripper clips and the importance of a firm bolt closure. A range demonstration at 400 meters emphasizes the need for milder handloads to preserve the vintage action.

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This video demonstrates the assembly and live-fire of the German 1936 pattern light mortar (L.Gr.W.36). It highlights the mortar's leveling mechanism for accuracy and the difficulty in visually tracking its 50mm projectiles after firing. The content showcases historical military hardware and its operational use.