Gun Review: CMMG Mk47 Mutant AR-15 in 7.62×39 - The Truth About Guns
Shoot any round through any firearm with subcaliber adapters - Carolina Sportsman
Adapters for ID = “Ladepatrone” and marketed by Frankonia since the 1970's - General Ammunition Discussion - International Ammunition Association Web Forum
What ammo is interchangeable with 7.62 x39? - Quora