If you chamber a variety of different AR15 calibers, then you know marking your magazines is much like a home improvement project. (Theres usually a lot of paint and tape involved.) But at SENTRY, we know just how important it is to safely, quickly and efficiently identify ammunition calibers, which is why we pioneered the first-ever colored rifle ammunition identification system the HexID Color Identification System. Having the peace of mind that your investment, health and safety are all accounted for using our color-coded magazines that can be changed without tools, and in under 1 min, has changed the industry. We think youll want to buy more magazines!