THESE CUSTOM BARRELS ARE MADE BY THE WILSON COMBAT, ARKANSAS USING THEIR OWN BLANKS. MIKE BELLM WAS AN INTEGRAL PART OF THE BARREL DESIGN. PLATFORM: THOMPSON CENTER Encore PROHUNTER. CALIBER: 300 HAM’R. FINISH: 416R Stainless Steel. RATE OF TWIST: 1-15. 850 HEAVY CONTOUR ANY RIFLE FOREND WILL WORK FINE. FOREND SCREW SIZE/SPACING: 8-40 / 5 Centers. THREADS: Yes 5/8-24 w/Cap. SCOPE BASE: 4 HOLE BASE PICATINNY STYLE FACTORY INSTALLED.