The U-15 Stock is a rifle stock designed to avoid the California definition of an "assault rifle". Cosmetic features such as pistol grips in conjunction with detachable magazines are defined in California as "assault weapons". To avoid the designation and render the rifle "featureless" one can replace the standard pistol grip and buffer tube of a standard AR-15 style rifle with this stock. As a result, the rifle is "featureless" and can have a detachable magazine. The design is reminiscent of the ergonomics used on the Hotchkiss M1909 and WW2 Japanese Type 11 light machine gun.