I have a HCS Mod 1 and a Mod 0 I pieced together with a WOA SPR. The Mod 0 was a little better shooter till about a yr ago, consistently shooting sub moa with 75gr hornady handloads. It has opened up to a little over moa since, reason unknown to me. The HCS is right about moa or a little over with the same handloads and both shoot cheap 55gr hornady fmj handloads well. I bought the Mod 1 used with supposedly very low rd count on another forum and have never dealt directly with HCS.