To correct loud noise on your indoor or outdoor range, you must use engineering controls designed to absorb noise across all frequencies. The UL-rated Troy System is an acoustic wall system that is installed on baffles, safety ceilings, drop ceilings, and sidewalls to ensure that you meet OSHA noise exposure limits and a 1.3-second reverb time. This system is USAF approved for anti-ricochet and anti-splatter for errant 5.56 and 7.62 rounds and received an excellent acoustic rating by the US Army Corps of Engineers for use in a shooting range.