Wassenaar Arrangement Semi-automatic Rifles (commonly referred to as WASR-series rifles) are a line of rifles sold in the United States by Century International Arms. The rifles are manufactured in Romania by the Cugir Arms Factory and are a semi-automatic variant of the Pistol Mitralieră model 1963/1965, a Romanian licensed derivative of the Soviet AKM assault rifle. Century imports them and modifies them in order to comply with national legislation before sale to the general public via licensed traders. The WASR series takes its name from the 1996 Wassenaar Arrangement, a multilateral export control regime to monitor and limit the proliferation of certain conventional weapons and dual-use technologies. Design and construction The rifles are semi-automatic firearms manufactured in Romania by the Cugir Arms Factory and based on the Pistol Mitralieră model 1963/1965 (PM md. 63/65), which in turn was patterned directly after the Soviet AKM, itself a modernized derivative of the AK-47. They differ from other AK pattern rifles in using internally welded spacer plates to center the magazine rather than dimples to strengthen the receiver above the magazine well. The arrangements of the rivets on the receiver and front and rear trunnions are distinctive amongst AK derivatives. The rifles use stamped sheet metal receivers that were originally intended for single-stack magazines and feature hard chrome-lined barrels, side-mount scope rail and wooden stocks. Modifications for the United States Once imported into the US, Century adapts the rifles to conform to national firearms regulations including Title 18, Chapter 44, of the United States Code. The regulations prohibit fully-automatic fire and limit the number of major components that may originate from outside the U.S. Century Arms installs triggers, pistol grips, and stocks manufactured by TAPCO of Georgia. Trigger slap Older WASR-series rifles commonly produced trigger slap, which is caused by the bolt slamming backward into the trigger assembly and causing significant pain to the shooter's trigger finger. Beginning in 2007, Century International Arms has installed the TAPCO Intrafuse AK G2 trigger group, eliminating the painful trigger slap problem. Rifles with this trigger group will have "TAPCO USA G2" stamped on the left side of the trigger. Some of these rifles may exhibit canted front sight blocks and gas tubes. Variants GP WASR-10 The GP (General Purpose) WASR-10 is a 7.62×39mm caliber semi-automatic rifle that has been offered since the end of the Federal assault weapons ban. Factory-original rifles only support single-stack, low-capacity magazines