NEW PRODUCTION THOMPSON CENTER BARRELS MADE IN NH. PLATFORM: THOMPSON CENTER Encore PROHUNTER. 810 HEAVY CONTOUR ANY pistol FOREND WILL WORK FINE. FOREND SCREW SIZE/SPACING: 8-40 / 2 9/16 Centers. THREADS: Yes 1/2-28 THREAD. SCOPE BASE: DRILLED AND TAPPED ONLY FOR A STANDARD T/C 4 HOLE BASE.