You need more than the release to make RT's release work. The pin that the original release and the bolt hold open pivot on is no longer used. It uses a very short threaded setscrew with a little nub machined on the end tapped into the trigger housing, that is what your hold open pivots on. I have 2 and they are the best going. Got mine from Greg before the major paranoia, not sure if anyone in Canada carries or imports them. Doubt if anyone in the US will ship to Canada anymore. Good luck.