TNW may eventually offer a better solution, but this is my plan for the interim. It uses an Ironsighter rail adapter (model 624M) because I already had one left over from a previous project, and will require the ASR (or ASP) barrel nut to be milled with the dovetail grooves a 22LR barrel would have for sight mounting. Because the adapter is longer than I want, it will need to be cut and a new clamp screw hole will need to be drilled and tapped. So why not just use the factory under-receiver rail? Because I'm old school (USAR, 1965-71) and that's where my left hand goes. Besides, a bipod does the most good when it's as far from the shooter's shoulder as possible. Input is welcome as I won't get this to the machine shop for a couple of weeks.