All rubber type bullet traps are designed to be placed against the back wall and require no reason to access them from behind. All maintenance and replenishment are conducted from the front of the trap. Rubber berm type traps generally require a depth of 15’-17’ (depending on the depth of rubber due to higher calibers (i.e. .50 cal. BMG)). Other designs such as GRC’s Ballistic Block Trap requires approximately 1 foot while the Step Trap and Rubber Berm (Hybrid) Trap require as little as 7 feet of space in depth from the back wall. General height for all GRC rubber type bullet traps is 8 feet.