Bostitch H30-8 heavy duty hammer tacker. Uses STCR5019 staples
Edward Tools Hammer Tacker Stapler for Arrow T50 Staples - Heavy Duty Industrial Design for Construction or Home - Fits staples 1/4”, 5/16”, 3/8” - Ergo Grip Handle - Balanced Weight Design - - Amazon.com
Arrow 0.375-in Heavy Duty Manual Hammer Tacker in the Carpet Staplers department at Lowes.com