Hello! Here are some examples of similar questions I could find by searching for "lever action" on the search feature if you want to take a look at more yourself

This thread has several answers discussing why armies preferred bolt over lever action rifles.

https://www.reddit.com/r/AskHistorians/comments/71woqm/why_did_militaries_favor_bolt_action_rifles/

/u/PartyMoses has a rather short, but decent answer on the problems with more complex lever action rifles when compared to the simplicity of bolt actionand /u/DanTheTerrible has a rather lengthy one discussing the US army's decision to adopt bolt action over lever action

The answers in this thread are more about addressing the use of lever actions in world war one, namely Russia.https://www.reddit.com/r/AskHistorians/comments/4vmpmt/did_leveraction_rifles_have_a_signiificant/

and finally I will leave you with this answer by /u/monkeymasher about some of the more technical advantages bolt actions had over lever action.

https://www.reddit.com/r/AskHistorians/comments/255tzc/why_did_bolt_action_rifles_come_to_predominate/

The question really isn't why lever actions weren't adopted in 1914-1918. The question is why they weren't being adopted in the forty-year period roughly between 1870-1910? This was when most of the weapons and small arms technologies (smokeless powder, bolt actions, machine guns) actually used in WWII were developed and adopted.

There were cases of armies using and issuing lever-action rifles during the 1860s and 1870s. However, these lever-action rifles were used chiefly because they were the only repeating rifle available. As the technology for magazine-fed bolt-action rifles arrived on the scene in the 1880s, everyone adopted them, for reasons we'll get into.

Most people are familiar with the use of Henry and Spencer rifles during the American Civil War and the Indian Wars. However, there's an even more notable moment in lever-action history most people don't know about.

During the 1877 Siege of Plevna, Turkish troops used about 8,000-12,000 Winchester .44 Model 1866 rifles to great effect. Turkish soldiers carried two rifles in the battle: the lever-action Model 1866 and the single-shot, falling-block .45 Peabody-Martini. The Peabody-Martinis were used to hit Russian troop formations up to 2,000 yards away. Once Russian troops go within 200 yards of their trenches, the Turkish soldiers switched to their Winchester rifles and poured rapid fire into the Russians. Once the Russians got within 50 yards, the Turks fell back to their next trench line and kept firing. Although the Turks eventually surrendered, they'd managed to delay the Russian advance into Bulgaria for a full five months and cost the Russians 40,000 dead and wounded.

The fighting at Plevna was just one factor that pushed European countries to adopt repeating rifles of their own during the 1880s (e.g. the Krag–Jørgensen, Lee-Metford, Lebel Model 1886, and the Gewehr 88).

Lever-action guns were used in WWI in some numbers, although there were used simply because bolt-action rifles weren't available or were more badly-needed elsewhere.

• British Contract Winchester 1892: About 15,000 Winchester 1892 rifles chambered in .44-40 were used by the British, mostly by Royal Navy boarding parties and Q-Ship crews. The short, handy carbine was more useful aboard ship than a Lee-Enfield or a Long Lee. The first 1,000 were donated to the War Office by patriotic baronet. In February 1915, 9,000 more rifles were ordered, followed by 2,000 in May 1915 and 3,000 in August 1915. The British ordered 3 million, of which at least some were fired in anger. The crew of the Q-Ship that sunk the German submarine UB-4 blazed away at the U-Boat with at least one Winchester rifle from just 10 yards away!
• French Contract Winchester 1894: In September 1914, the French ordered 15,100 of these rifles in .30-30 from Remington (yes, Remington), their primary arms supplier in the United States, who then sub-contracted Winchester to actually build the rifles. These rifles were issued to artillerymen, railway troops, motorcycle couriers, and even the odd balloonist. Once again, the short lever-action rifles were compact and handy weapons for men who had to carry a weapon, but didn't expect to do much shooting. Because the .30-30 wasn't a French-made round and wasn't easy to get, the 1894s were never issued to combat troops. The logistical hassle was just too great.
• Russian Contract Winchester 1895 (see here, as well): About 300,000 of these rifles chambered the Russian 7.62x54R cartridge were ordered by the Russians between 1915 and 1917 (about 70% of the 1895s ever made). These rifles were just some of the 4 million military rifles (including millions of Mosin-Nagants) Russia ordered from the USA during the war, something I've written about here. It wasn't that the Russians thought the lever-action was especially good or especially bad. It was just that Winchester had the capacity to quickly modify its existing production line to produce a 7.62x54R version of the 1895. Building new Mosin-Nagant production lines in the U.S. was still worth pursuing, but it'd take time. And Russian needed rifles now.

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