This DOES NOT enable the usage of drum magazines. This is intended for lua mods that visually change the appearance of attachments.
(I recommend this mod: https://modworkshop.net/mydownloads.php?action=view_down&did=13243)

Fixes the animations and adds a bullet to the model for the drum magazines.
Also includes the unused RPK magazine (wpn_fps_lmg_rpk_m_standard) as a bonus.
Demonstration video: