Witmer Public Safety Group, Inc. (WPSG), the nation’s leading multi-channel distributor of public safety equipment, supplies, training,  and service, is excited to announce their recent acquisition of Interstate Arms, the nation’s oldest wholesaler of firearms, weapon accessories and ammunition, headquartered in Billerica, MA. “We are pleased to bring Interstate Arms into our family of public safety brands,” said James Witmer, CEO of WPSG.  “In addition to serving the wholesale commercial firearms industry for over four decades, Interstate Arms has also…