MagVault AR Rifle Magazine Lock : Better than Trigger LocksExtensive customer demand was the inspiration for the GunVault MagVault (AR-01), a revolutionary way to keep your AR rifle safe and secure at home, during travel or on the range. This unique design fits in the magazine well and locks in place quickly. Versatile, easy to use and priced to fit any budget, the MagVault is a must for AR owners.This unique design fits in the magazine well and locks into place to keep the AR safe and secure at home, during travel or on the range. Once the AR MagVault is locked into place a round cannot be inserted or chambered.The AR MagVault features an easy-to-operate key lock system and fits virtually all .223/5.56 AR carbine rifles. It is constructed from extremely durable glass-reinforced nylon for maximum durability.