Contact Chuck Madurski at Great Lakes Arsenal 60233 Northern Ave. Ray, MI 48096-3914 e-mail: glainc@tir.com. He will be happy to help you. The last I knew, a new 870 BBl. with choke was $225. shipped, or you could send a barrel to him to be done. Small Arms Review,Jan2000, had a good review on the Mod 37 with the Duckbill and the new barrels. Thanks for the reply!!!