Bandit barriers are most effective when they’re part of a systems approach that includes several components working together. The cost depends on the size of the system and the number of individual components required. While a small system consisting of a transaction window, voice port and cash tray may start around $7,000, mid-sized bullet-resistant barrier systems are more common for bank branches. These involve larger surface areas and often millwork, such as adding ballistic fiberglass to reinforce counters. The cost of these systems typically starts at $15,000, not including installation.