Two Soviet 7.62 mm RPK squad light machine guns, the top one with a 40-round box magazine and the bottom one with a 75-round drum magazine - PICRYL - Public Domain Media
Better NPC RPK model (with Drum Mag) by Alcat101
Chinese NHM91 RPK setup with drum mag - John's Gun & Pawn | Facebook
Evolution Miniatures A35015 RPK LMG 3 in 1 Rifle Model Kit Tripod + Drum Mag | eBay