The KCI Custom window Steel 7.62×39 Magazines. We originally made a batch of the 30 round magazines for a photo Video/Photo shoot and had an overrun we wanted to share with our customers. These are great magazines that are very reliable. This very cool design allows you to view the amount of rounds in your magazine and run flawlessly in full auto or semi. You will NOT find a windowed skeleton magazine anywhere that can touch this price! Due to the popularity of our 30 round window magazine we are proud to announce the 40 round magazine with an even larger window and skeleton cuts. - These are Designed to fit your AK-47 / AKM pattern rifles chambered in 7.62x39mm. Constructed of steel with a Cation Electrodeposition Coating these magazines will withstand the toughest corrosive environments. A high-tensile-strength music wire compression spring anti-tilt follower and reinforced feed lips provide reliable feeding and long life. - These are extremely nice 40rd AK-47 magazines. Brand new all steel construction beautiful black finish. - Features a reinforced ribbed back for superior strength. These are cut to the same pattern as the original Chinese ribbed back mags and should fit virtually all AK type rifles without modification to the mags.