The APC SD suppressor is for use with B&T APC SD models. This over the barrel suppressor has been updated with Reduced Backpressure System technology significantly reducing the combustion gases escaping from the ejection window venting excess gas at the muzzle end of the suppressor and away from the shooter. A low-pressure expansion chamber minimally increases the size and weight of the unit compared to conventional baffled models all while providing industry-leading sound and flash signature reduction and a neargas-free shooting experience.