This has already been the case for MANY years, so long in fact that an entire industry have been created to supply a market with large bore versions of AK's and other weapons classed as smoothbore shotguns because only the last few inches of the barrel is rifled.
This has already been the case for MANY years, so long in fact that an entire industry have been created to supply a market with large bore versions of AK's and other weapons classed as smoothbore shotguns because only the last few inches of the barrel is rifled.
https://www.thefirearmblog.com/blog/2015/08/13/the-new-russian-shotgun-round-366-tkm-for-sks-ak-rifles/
https://www.thefirearmblog.com/blog/2018/08/30/kalashnikov-concenrns-tg3-svd-chambered-in-9-6x53mm-lancaster/