I have an Hi Standard H-A . Its rough and not quite collector grade . I am going to make it into a integral suppressed .22 but they only made a thousand of the H-A's and I dont have the heart to carve up the original barrel . So I figured I'd look around and find another early Hi Standard barrel and keep the H-A barrel in case I ever want to reunite it with the gun. The barrels have different profiles between models but they pretty much all interchange between models up to the 50's. Did a little looking around and found a NOS model B barrel still in the original oiled paper wrap stamped Property of USA on top brand new condition after 80 years never been on a gun. $75. Maybe the only one like it. So thats the barrel I'm going to carve up .