>Tests have shown that the ADS is effective in both environments; above water, its accuracy is comparable to military-issue AK-74s; underwater, it is more accurate and easier to handle than the older APS rifles. As of 2018, the ADS is entering mass production and is fully phasing out older APS underwater rifles.
Why I didn't know that Russia is actively producing a new generation of underwater rifles?
Not even underwater really, Amphibious, it uses a special variant of 5,45 for underwater shooting and the normal rounds for above water.