MAN also produced gun parts, including Mauser Karabiner 98k rifle bolts. Attaching such sights to a Karabiner 98k required machining by a skilled armourer. The Karabiner 98k was not designed to accept telescopic sights. The Karabiner 98k rifle was designed to be used with an S84/98 III bayonet. The Karabiner 98k has a sight radius. Resistance forces in German-occupied Europe made frequent use of captured German Karabiner 98k rifles. The butts of the semi-pistol grip Karabiner 98k stocks were not uniform. Gewehr 98 and Karabiner 98b were sometimes rebuilt to the Karabiner 98k configuration. Recreations of this rifle using Karabiner 98k ZF-41 mounts sell for about US$5000. Karabiner 98k receivers were stamped with a factory code indicating date and location of manufacture. It is virtually identical to the Karabiner 98k. There were three Karabiner Model 1931 variants that featured telescopic sights. However, the BRNO factory switched over to the Karabiner 98k in 1943. The barrel was only -long, comparable to the barrel of the "Karabiner 98AZ". This model featured an extended stock and barrel similar to the M1896 Kavallerie Karabiner.