Following thorough testing and evaluation by their Lead Firearms Instructor, the Port Authority of Allegheny County, PA has officially approved the Apex Tactical Specialties DCAEK for use in Duty/Off Duty S&W M&P's for it's officers. This is a huge milestone for a small company like Apex. We've had numerous LE agancies across the country request and receive T&E samples of our DCAEK and this is the first one to officially add the DCAEK to their list of permitted modifications.