The Ubiquitous AK-47 https://i0.wp.com/www.chooseadventurebook.com/wp-content/uploads/2022/04/AK47.png?fit=640%2C234&ssl=1 640 234 Greg Ellifritz https://secure.gravatar.com/avatar/e0796fbe64c5c54764b80b72b3148061?s=96&d=mm&r=g
The most common rifle I see in all my travels is some version of the AK-47/AK-74. They are so common that I really think that all travelers should have a basic familiarity with the weapon system.
I found the article linked below to be an informative dissertation on the AK family of rifles.
Survival Weapons: The AK Rifle