AR-57

The AR-57 is a carbine/personal defense weapon designed and produced by AR57 LLC of Kent, Washington in the United States. It is available as either an upper receiver package for the AR-15/M16 rifle or as a complete rifle. Versions are offered in both semi-auto only and in select fire, and was marketed primarily to law enforcement agencies as a potential competitor to the FN P90. While the AR-57 shares many outward similarities to the AR-15, there are a number of key differences. Unlike a standard AR-15, which uses a gas piston system to work the action, the AR-57 instead cycles via convent...