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The desire for adopting new shorter barreled rifles and the introduction of the Karabiner 98k, featuring a 600 mm (23.62 in) long barrel, were reasons for changing the standard German service ball rifle cartridge. The 1903 pattern 7.92×57mm Mauser S Patrone produced excessive muzzle flash when fired from arms that did not have a long barrel like the Gewehr 98. Patrone, originally designed for long range machine gun use, produced less muzzle flash out of rifles that had a shorter barrel and also provided better accuracy. Because of this the S Patrone was phased out in 1933 and the s.S. Patrone became the standard German service ball cartridge in the 1930s. The Karabiner 98k is a controlled-feed bolt-action rifle based on the Mauser M98 system. Its internal magazine can be loaded with five 7.92×57mm Mauser cartridges from a stripper clip or one-by-one. After loading, the empty clip is ejected when the bolt is closed. The straight bolt handle found on the Gewehr 98 bolt was replaced by a turned-down bolt handle on the Karabiner 98k. This change made it easier to rapidly operate the bolt, reduced the amount the handle projected beyond the receiver, and enabled mounting of aiming optics directly above the receiver. Each rifle was furnished with a short length of cleaning rod, fitted through the bayonet stud. The joined rods from 3 rifles provided one full-length cleaning rod. The metal parts of the rifle were blued, a process in which steel is partially protected against rust by a layer of magnetite (Fe 3O 4).

Such a thin black oxide layer provides only minimal protection against rust or corrosion, unless also treated with a water-displacing oil to reduce wetting and galvanic corrosion. From 1944 onwards phosphating/ Parkerizing was introduced as a more effective metal surface treatment. The impractical Langevisier or "rollercoaster" rear sight of the Mauser Gewehr 1898 was replaced with a conventional tangent leaf sight. The Karabiner 98k rear tangent sight was flatter compared to and does not obstruct the view to the sides during aiming as the Langevisier. Originally, the Karabiner 98k iron sight line had an open-pointed-post-type (barlycorn) front sight, and a tangent-type rear sight with a V-shaped rear notch.

From 1939 onwards the post front sight was hooded to reduce glare under unfavourable light conditions and add protection for the post. These standard sight lines consisted of somewhat coarse aiming elements, making it suitable for rough field handling, aiming at distant area fire targets and low-light usage, but less suitable for precise aiming at distant or small point targets. It is graduated for 7.92×57mm Mauser s.S. Patrone cartridges loaded with 12.8 g (197 gr) s.S. ( schweres Spitzgeschoß – "heavy pointed bullet") ball bullets from 100 to 2,000 m (109 to 2,187 yd) in 100 m (109 yd) increments.