DESCRIPTION: Very scarce Polish pre-World War II wz. 1931 single shot military trainer! The rifle displays following markings on the receiver: "Polish Eagle, F.B. Radom 1939"("F.B." = Fabryka Broni = The Arms Factory at Radom, Poland). This is the last year of production. The left side of the receiver rail displays model markings, "kbk.S. wz.31". Wz. 1931 rifle was a standard Polish military trainer in the 1930-s. "Kbk.S" is a Polish language abbreviation that stands for, "karabinek sportowy" (sporting carbine). Accordingly, "wz" (wzor) will translate to "model", or "pattern". Despite such a sporting nomenclature, kbks was used mostly as a military trainer for Polish recruits. Many such rifles were also given to various level schools and universities for student military training. Externally, the rifle is very similar to wz.1929 Mauser rifle, as it was meant to be a trainer for Polish army recruits. The dimensions and weight are also almost identical to those of wz.1929 rifle. All matching serial numbers except stock and buttplate, which has 249 higher number (the matching serial numbers are stamped on the receiver, barrel, rear sights, extractor and bolt; other parts of the rifle do not have serial numbers, which is correct for this model). All the serial numbers are factory original, and they were not restamped. The rifle has an original black baked enamel over phosphate finish on metal. Military style front sight with protective wings. Military style, adjustable rear sight calibrated from 20 to 100 meter. The rifle was manufactured with a short finger groove in the forestock. Steel buttplate and trigger guard. Polish Mauser style sling swivels (correct). Correct bolt with straight handle. There is no cleaning rod and it it doesn't accept one (original design).. Overall length is 43.25 inch. The barrel length is 24.50 inch. This rifle comes from Kristopher's collection of Polish military firearms. CONDITION: Fine plus. 85-90% of original finish is still on metal. Nice stock with some handling marks, light dings and small scratches. The left side of the stock has a horizontal line separation (just behind rear sling attachment, please, see pictures). The rifle has a duffel bag cut. Wood is in original finish. Excellent bore with shiny rifling. Strong action. Mechanically the rifle is in excellent condition as well. All the internal parts of the rifle are in excellent condition, with no visible wear. No import markings. Rifle comes with a nice sling but probably not of Polish origin. Very scarce Polish kbks wz.1931 military training rifle! Serial# 15687.