It is advertised and marked as fitting in 20-ga semi-autos but does not even come close to going into the chamber. It won't even fit through the ejection port. I am having to spend 45 minutes on the grinding wheel to get them to fit a 20-ga.
These 'do not' fit all 20 gauge.. These will/do not fit in the ejection chamber of my Winchester SXP 20ga.. I guess that's why there is a not return policy..