Stability is not in fact horizontal recoil, and control is not vertical recoil. You might be confusing that we previous CoD titles. In Delta Force stability is just how it sounds, its how well your player can hold the gun in a stable fashion, whether that is firing, just aiming, or even holding your breath they all take your stability into consideration. Having a higher stability score will not affect real recoil at all, it can make recoil feel less severe due to the higher stability but each shot has the same amount of recoil no matter the level of stability. Control is just flat out recoil control, it affects both vertical and horizontal unless specified by the weapon part.