The biggest drawback is your muzzle. When in a horizontal holster rig, your gun is pointed directly at whatever is behind you. Even with “muzzle down” rigs, when you draw, it’s hard not to have your muzzle pointed at people and things to your side as you bring your gun to target. The whole topic of when it’s OK to use a shoulder holster is too complex for this introductory article, so we’ll have to cover that in more detail later. For now, be aware of the muzzle issue! Also, you’ll need to wear that covering jacket all the time, unless you work in a police station. Barney Miller and crew used these, but they had the luxury of going “bare” while in the office. One more thing: To draw, you’ll have to reach across to the opposite side of your body, which may be difficult if you’re in a physical struggle.