Manufactured between 1955-1958, the ZFK31/55 is a derivative of the K31 rifle configured for precision long range shooting that is complete with its matching 3.5X sniper scope. Reportedly 4,150 were produced in total. Blade front and tangent rear sights, with a combined flash hider and bayonet lug unit integrated into the sight, "Swiss Cross and Shield" engraved on the receiver ring, and a set of integrally forged scope bases on the left side of the receiver. Matching serial numbers visible on the barrel, receiver, bolt, underside of the handguard, inside of the stock channel, scope and magazine. The bottom of the magazine is marked with the matching number above "Zf.Kar.", denoting use with a scoped rifle, and the scope is marked with the matching number above "KERN AARAU/V=3.5/(view angle symbol)=75 0/00". The scope has a three-post reticle and is fitted with a set of integral claw bases. Smooth pistol grip beech wood stock, with a folding bipod just ahead of the magazine well, forearm grooves, checkered wrist, and flat buttplate. Includes a scope case numbered "4994" on the lid to match the scope, and containing a screwdriver tool.

Excellent, retains 95% plus original blue finish with some light edge wear and 85% original black painted finish on the bipod legs with some light flaking. Stock is very fine with some scattered light handling marks, a few mild gouges on the left, and distinct edges and grasping grooves. Mechanically excellent. The scope is also excellent, retains 99% original blue finish with crisp clear optics. The case is excellent overall.