there should be no collision box in the model. Collision is generated using this
boundingBox = vectorScale("7 3 6", 2); //"2.5 2.5 2.4";
crouchBoundingBox = vectorScale("7 3 6", 2); //"2.5 2.5 2.4";
proneBoundingBox = vectorScale("7 3 6", 2); //"2.5 2.5 2.4";
just resize the model