Abstract: A long gun stabilization kit for use with a body armor vest, including a vest clip and a butt end portion. The vest clip includes a clip body and a ball, and has vest attachment means for attaching to the body armor vest. The vest clip is characterized by a vest interface plane having a normal, and the ball is connected to the clip body by a projection extending from the clip body at an angle that is downward, and left or right relative to the normal. The butt end portion has a socket shaped to receive the ball and permit rotation about at least one axis. Body armor may comprise a vest clip connected to a body armor vest. A long gun may have a barrel, and a stock having a butt end, a portion of the butt end having a socket of fixed geometry.