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