The original gun I bought was a full choke 3 1/2" 12 ga. I bought it for more less a back up to my Mossberg 500A . I took it up to my camp to test fire it with 3 1/2" #6's My camp is in upstate New York. When I pulled the trigger, that single shot sent me flying back all the way to Podunk ,Vermont and had to hitchhike back home. I sent the receiver back to NEF ( H&R ) for a new 12 ga. tube with a screw in choke. That tube takes the same choke as my Mossberg 500. I use the Undertaker Choke. I also have a 20ga. Mossberg 500 that I've shot turkeys with and I use a 20 ga. Undertaker with that one. I again sent the receiver back to Remington, this time and they fitted a 20ga. tube with a screw in choke -- I use the same 20ga. Undertaker choke in it. Undertaker with Federal Flite Control Heavyweight #7 --- It's a 40 yard killer. I carry my 12 ga tube in my truck during turkey season and in 3 min. can interchange it if I want a 12ga. I shoot Remington Duplex 4x6 in the 12 ga. ---- In the off season this utility gun is found in my truck with the 12ga tube on it as a truck gun. --- Web