I agree with Wingbone...Many if not most barrels currently made for the Express/870 are now threaded for choke tubes, and usually come with 2 or 3 when you purchase them...

26" is a good all around length..It's a lilttle longer than I prefer for a turkey gun, but it would work fine, and it's an excellent length for upland birds and small game and would work well for ducks and geese.. For turkeys use a full choke or an aftermarket superfull turkey choke...For waterfowl and upland use a more open choke, such as improved cylinder or modified...