This site shows it in stock (shows other items out of stock, so the inventory appears to be correct). I've never used this site, but it doesn't want you to pay with anything like crypto that most scam sites do. It appears g2g, but double check.
Overview The R-LOCK feature in the clamp is a 5mm pin that mates with corresponding R-LOCK holes in the rail. The pin is spring-loaded to automatically engage the R-LOCK holes or be pushed down by non-R-LOCK rails, making it compatible with a wider range of “arca-type” rails. The user also has...
thermalopticsplus.com