No mention of pricing yet, at least not that I could find on RA-Tech. Seems like an interesting approach to allow "hot" gas guns to be dialed-down to acceptable levels, esp. for the indoor crowd. At least one only has to replace the bolt and not the entire assembly including the carrier so that's not so bad I guess. Although I do believe that as you lower the FPS, the percent of gas directed into recoil goes up, resulting in a harder thwack for the internals to deal with. Hope they're reliable and sturdy enough...??
Airsoft's turning out to be almost as expensive a proposition as aviation and I don't even get to leave the ground!