FRANKFORD ARSENAL PHILADELPHIA PA AMMUNITION DEVELOPMENT AND ENGINEERING LABS
This report presents physical and functional descriptions and acoustical evaluation of various domestic and foreign silencers and silenced small arms weapons. Included are cross-sectional drawings and external view photographs of all systems tested. An acoustical evaluation of each system is given in the form of far field sound pressure-time records. All major constituents of sound signatures are identified and time-correlated with their respective sources in the system. Additionally, the report presents a record of silencing principles and a theoretical analysis of the various noise generating phenomenon.