As stated above, modified factory, or aftermarket. These style thumb latches were popular with the PPC crowd back in the 1980's. They are still available. I tried one, and never noticed it was any quicker or more positive than the standard thumb latch I was used to while competition shooting, and its design could cause problems with duty use.
Larry
Last edited by Fishinfool; 07-25-2018 at 11:49 AM.