Made for better use in colder environment, these Maximum Range (MR) buckings are made from clear silicone. Inside the bucking there's a circular rubber inner ring, just push the bucking on with a little bit of force. An excellent bucking that gives an extremely tight fit onto the inner barrel.
Inside of the bucking there's a much larger contact pad that pushes down onto the BB. To get the best out of the ideally use with an Omega nub.