The Byrna HD is the best CO2-powered handheld personal security device mainly used for home-based security. It can fire 68 caliber chemical irritant projectiles filled with a highly potent OC (pepper spray) and CS (tear gas). Byrna Technologies. Inc. is a Massachusetts-based company that proves its excellence in manufacturing non-lethal weapons. Byrna has also specialized in selling the less lethal munitions to the military, law enforcement, and other agencies.   The company always wants to help their customers, so they try to provide an attractive discount. Using Byrna coupon codes, promo codes, and discount codes, you can save money.