It didn’t come with xtra chokes?

 

Very few of the old Huglu 20s took mobile chokes, but the Drakes don't interchange - and are solely Huglu chokes . I think I've got an old Mallard that uses mobil.

 

The 12 gauge CZ will accept a Beretta Mobil choke because at that size the Huglu and Beretta chokes have the same thread pitch and diameter. With the 20 gauge the thread diameters are the same but the thread pitch is different. So with the 20 gauge you will have to use Huglu Chokes. Good news is that both Carlson and Briley's make Huglu chokes.

 

Tru lock also makes the Huglu chokes for your 20.