CZ 858 barrel.

[$kull]

The 858 features a non-chrome lined barrel. Non-chrome lined barrels in zippier cartridges typically last about 5K if I recall correctly. In 7.62x39, my personal guestimate would be 7000-10 000. A chrome lined barrel, like the ones found on the CSA Vz58, should last a very long time. CSA uses Lothar Walther barrels made of 4340 steel, which is typically used for machine gun barrels, and I *think* it's cold hammer forged. CHF+machine gun steel+chrome lining means it should last a very, very, very long time. AK's can last a long time. Regularguy Training on youtube has a MAC 90 Chinese AK that still has a good barrel post 19 000 rounds, and it is chrome lined, but I don't know if it's CHF or the barrel steel. Reid Henrichs has talked about putting 100 000 rounds per year through his AK's. I think the CSA should last to at least 19 000, maybe longer. EDIT: Definitely longer, his AK's barrel wasn't worn out at like 25 000. CHF and chrome lining and machine gun steel is a winning combination.

The Lothar Walther barrels are button cut, not cold hammer forged.

Lifespan in all cases is going to be determined not only by total round count but the conditions under which you're shooting. Since up here we're stuck with 5/10 rounds per mag, doing mag dumps/bumpfires to simulate FA fire is unlikely.
I know that a chrome lined CHF AK barrel in Bulgaria is rated for around 10 or 15k *in full auto*. In other words, worst possible conditions. Shooting in semi and not abusing it should get you twice that.