I'm thinking that's what I have ( non-standard).All the ARIETE models are 410 unless the are M1,M2 etc which are 12Ga. Pretty sure this one is European says Cal 20 not 20 ga and it has what looks like factory sling swivels I really want to shoot ducks over decoys with it and would like to use steel. Any ideas if the i/m would allow that. If two stars means i/m??