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Adjustable Retention Modular System (A.R.M.S.) The Adjustable Retention Modular System or A.R.M.S. by CrossBreed Holsters is the perfect combination of modularity and adjustability. This versatile system is designed to accommodate your active lifestyle with ease by giving you multiple options for carrying. Whether you're at work, on a jog, in the woods, or even just enjoying an evening at home the A.R.M.S. has you covered. Adjust Retention Is Perfect Retention The A.R.M.S. Holster features a Reckoning style pocket designed to perfectly fit your firearm with multiple points of retention adjustment. By simply tightening the screws that mount the pocket to the leather backer you can ensure that you have the perfect amount of retention to meet your carry requirements.