Please go to the FAQs and check out: •How can I measure the chamber length of my L.C. Smith shotguns? •When did the Hunter Arms Co. lengthen 20 and 16 gauge chambers? •Should I lengthen the chambers in my L.C. Smith 20 gauge or 16 gauge shotgun?
Do NOT shoot 2 3/4" shells in a 2 1/2" chambered 20g