My Dad picked up a used 20 gage Weatherby Orion O/U for Mom. As it was a used gun it only came with an Improved Cylinder and Modified Choke Tube. Dad wanted to get a Full, Impove Modified and possible a skeet tube for it. I think it takes the 11/16 X 32 choke tubes that will also work in most Winchesters, Mossburgs and SKB. It this the correct size/type? What would you guys recomend as a brand of choke tubes for this gun? Thanks ahead of time for the help.