I suspect the AZ tag will outlive most of us as it's been used for so long and in so many references. Just for "fun" I looked up Kar 98a on wiki (as listed on the Gewehr 98 page) It states there was a Kar 98A(uppercase) that was the original, short barrel carbine from 1902 and the 1908, longer barreled Kar 98AZ later to become the Kar 98a (lowercase). Don't recall reading that before in Storz or Olsen's book. Was the Kar 98A tag just a collector label like the Gew 98M? Apologies for linking the wiki page reference!
Karabiner 98a
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Karabiner 98AZ / Karabiner 98a
Not to be confused with the later
Karabiner 98k or the earlier Karabiner 98A (uppercase A), the Karabiner 98a (Kar 98a) was a shorter version of the Gewehr 98 originally made for cavalry and support unit use. The Karabiner 98A, adopted in February 1902, had a considerably shorter barrel than the Gewehr 98 and was also lighter at 3.42
kg (7.5
lb) empty. Experiments in 1904 with Karabiner 98A carbines rechambered for the
S Patrone cartridge showed excessive recoil and muzzle flash problems, leading to the suspension of production in 1905.
[17] The
Gewehr Prüfungs Kommission (GPK) started developing a new carbine with a longer barrel and a different stock to address these problems; by the mid-summer of 1907, the longer barrelled prototype carbines showed more acceptable recoil and muzzle blast behavior with the
S Patrone.
In January 1908, the Karabiner Model 1898 AZ (Kar 98AZ) was accepted for service. The new features were a small diameter (33 mm (1.30 in)) receiver ring, tapered rather than stepped barrel contour, an L-shaped stacking rod attached to the stock near the muzzle, and a turned-down bolt handle and recess in the stock in the same fashion as the Gewehr 98s sniper variant. The "AZ" stands for "Aufpflanz-und-Zusammensetzvorrichtung",
[18] meaning "with bayonet attachment point and stacking rod". At the end of World War I about 1,500,000 short rifles had been produced. In 1923, the AZ was renamed to 'a', as Germany sought to distinguish the model from the newer 'b' and 'k' models.
[19]
During World War I, the Karabiner 98a was issued to light infantry, cavalry, mountain troops, and later to
assault troops. It was liked because it was lighter and shorter than the Gewehr 98, and was thus better suited for use in trench assaults.