Kalashnikovs were designed to have a cup type of rifle grenade launching device.
Yeah seems like that. But there has to be a reason other than aesthetic purpose as it adds inches to your weapon which is not suitable for terrorists.
you are rather over-analyzing it
both SKS and AK forks from many eastern euro manufacturers did have muzzle devices for rifle grenades, like Yugoslavian one, Hungarian one, Polish one etc
besides it's apparent from this pic here, presence of rifle grenades verifies it
notice the fins at end of those green almost tandem shaped grenades, and gas rings on the muzzle device, it seems some sort of rifle grenade only
judging from thinner profile and shape, i think it's some sort of anti-personnel or breaching grenade
ALSO, those AKs are not standard ones but crafted from mixed parts, like the very first AK has east german MPi-series AK's handguard but east german AKs as far as i know did not come in underfolding stock variants so it must be some other one, then second AK is definitely Type-56 underfolding stock and so on
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