The SRS Outdoorsmans+PIC rail (ODM rail) is the only available direct mount option for shooting off an ODM tripod and mounting a bipod. These are 4” OAL, and allow for a 1”-3” bolt spacing. Weight is .7 oz.
THESE ONLY WORK WITH OUTDOORSMANS BRAND TRIPOD HEADS WITH THE NARROW PLATE. THIS IS NOT ARCA SWISS COMPATIBLE.