Has anybody bought a Savage Sporter prefit or maybe Heavy Sporter prefit from Shilen? If so, are they two-taper barrels, or bell shaped as Jon @ Savage-Barrels.com calls that contour? Or, are they straight taper like a Predator contour barrel, and therefore thicker than factory, especially in the forearm area? Are the Mcgowen prefit Sporter (not magnum) the same exact contour as factory sporter barrels? Thanks to anybody that can inform me. ;D