spring guide rod from the AK and a new forward flat guide rod and coil spring. It features a thick laminated wood foregrip and a fixed laminated wood "club-foot" buttstock similar to the stock used on the RPD, which is designed to allow the user to fire from the prone position more comfortably. It uses a standard AKM pistol grip and can also use standard AKM detachable box magazines, but it is most commonly used with a 40-round box magazine or a 75-round drum magazine. Interchangeability of parts between the RPK and AKM are moderate. Sights The weapon's rear sight leaf is elevation adjustable, and graduated for ranges of 100 to 1,000 meters in 100 m increments. The rear sight leaf also features a windage adjustment knob unique to the RPK series of rifles. Accessories Supplied with the RPK are: spare magazines, a cleaning rod, cleaning kit (stored in a hollowed compartment in the buttstock), a sling, oil bottle, and magazine pouches (a single-pocket pouch for a drum magazine or a 4-pocket pouch for box magazines). Variants RPK The RPK is the standard light machine gun/squad automatic model and is chambered in 7.62×39mm. It was adopted by the former Soviet Union and was issued mainly to motorized units. It was later adopted by several military agencies around the world. RPKS The RPKS ("S" — Skladnoy (Russian: складной) means "folding" [stock]) is a variant of the RPK with a side-folding wooden stock was intended primarily for the air assault infantry. Changes to the design of the RPKS are limited only to the shoulder stock mounting, at the rear of the receiver. It uses a trunnion riveted to both receiver walls that has a socket and tang, allowing the stock to hinge on a pivot pin. The trunnion has a cut-out on the right side which is designed to engage the stock catch and lock it in place when folded. The wooden stock is mounted in a pivoting hull, which contains a catch that secures the buttstock in the extended position. The rear sling loop was moved from the left side of the stock body to the right side of the stock frame. RPK-74 The RPK-74 (РПК-74) was introduced in 1974 together with the AK-74 assault rifle and chambered for the new 5.45×39mm intermediate cartridge. It was derived from the AK-74 rifle, with modifications that mirror those made to the AKM to