A method of installing a shooting range system, the method comprising: positioning at least two first modules (12a-b, 14, 214, 312a-d, 412a-d) in side-side relationship, each said first module have a first end with at least one shooting position, a second end, a pre-engineered door opening configured to receive a door at said first end, characterized in that: each said first module (12a-b, 14, 214, 312a-d, 412a-d) has at least one removable panel disposed between said door opening and said second end and disposed downrange of the at least one shooting position and associated with a first wall of said first module (12a-b, 14, 214, 312a-d, 412a-d), each of said at least two first modules (12a-b, 14, 214, 312a-d, 412a-d) having a wall including an exterior insulation layer disposed on the wall, an exterior finish layer disposed upon the exterior insulation layer and preventing infiltration of weather elements to the insulation layer, and an interior bullet, shot, or projectile resistant layer positioned at an opposite side of the-wall from the exterior finish layer; and, following positioning said at least two first modules (12a-b, 14, 214, 312a-d, 412a-d), aligning said first end and said at least one removable panel of each said first module (12a-b, 14, 214, 312a-d, 412a-d) and mounting said at least two first modules (12a-b, 14, 214, 312a-d, 412a-d) together. positioning at least two first modules (12a-b, 14, 214, 312a-d, 412a-d) in side-side relationship, each said first module have a first end with at least one shooting position, a second end, a pre-engineered door opening configured to receive a door at said first end, characterized in that: each said first module (12a-b, 14, 214, 312a-d, 412a-d) has at least one removable panel disposed between said door opening and said second end and disposed downrange of the at least one shooting position and associated with a first wall of said first module (12a-b, 14, 214, 312a-d, 412a-d), each of said at least two first modules (12a-b, 14, 214, 312a-d, 412a-d) having a wall including an exterior insulation layer disposed on the wall, an exterior finish layer disposed upon the exterior insulation layer and preventing infiltration of weather elements to the insulation layer, and an interior bullet, shot, or projectile resistant layer positioned at an opposite side of the-wall from the exterior finish layer; and, following positioning said at least two first modules (12a-b, 14, 214, 312a-d, 412a-d), aligning said first end and said at least one removable panel of each said first module (12a-b, 14, 214, 312a-d, 412a-d) and mounting said at least two first modules (12a-b, 14, 214, 312a-d, 412a-d) together. each said first module (12a-b, 14, 214, 312a-d, 412a-d) has at least one removable panel disposed between said door opening and said second end and disposed downrange of the at least one shooting position and associated with a first wall of said first module (12a-b, 14, 214, 312a-d, 412a-d), each of said at least two first modules (12a-b, 14, 214, 312a-d, 412a-d) having a wall including an exterior insulation layer disposed on the wall, an exterior finish layer disposed upon the exterior insulation layer and preventing infiltration of weather elements to the insulation layer, and an interior bullet, shot, or projectile resistant layer positioned at an opposite side of the-wall from the exterior finish layer; and, following positioning said at least two first modules (12a-b, 14, 214, 312a-d, 412a-d), aligning said first end and said at least one removable panel of each said first module (12a-b, 14, 214, 312a-d, 412a-d) and mounting said at least two first modules (12a-b, 14, 214, 312a-d, 412a-d) together.