I have a brand new never used Muller U4 Featherlite Competition choke tube for Kolar .740 bore shotguns that I would like to either sell of trade for a U3 . New these are $89 but I was able to get a 10% discount. I'll eat the tax and pay a stupidity tax for buying the wrong constriction and sell it for $75 and I'll even ship it to the lower 48 at my expense. If yo have a U3 tube to trade - PM me and we can discuss how to get them swapped. BTW - the discount code I used to get the 10% off from the Muller website was: GAYLR10 I'm guessing it is still valid and can be used by anyone.