I attached both mine to a 642 UC and 442 Pro, both worked okay, however, I felt some minor binding. My take is that the cylinder release works in a simple forward and back motion, and the upward push seemed weird/different for me. I’d say that with training these would be nice, just not for me. Great product, well made, but I won’t use the, I do thank TK for their initiative to improve a good product, thanks TK.
