NEW PRODUCTION SSK BARRELS. T/C PART NUMBER 8278R. PLATFORM: THOMPSON CENTER Encore PROHUNTER. 810 HEAVY FACTORY CONTOUR, SYNTHETIC AND WOOD RIFLE FORENDS WORK FINE. FOREND SCREW SIZE/SPACING: 8-40 / 5 Centers. THREADS: Yes 5/8-24 THREAD. SCOPE BASE: DRILLED AND TAPPED ONLY FOR STANDARD T/C 4 HOLE BASE.