Without a loop, vertical rigs don't work as well since they don't balance well and pulling up on the gun pulls up on the holster..for a 442 you are better of with the butt hanging down...alos, the 442/642 is so light, it doesn'tneed the support of the loop....JMO.
Not a great pic, but this is my Alessi bodyguard with a pull thru snap...about the best there is for the little snubs...