That's an awesome gun. I put a Hunter's Specialties Choke tube in mine and gave it a DIY camo paint job since it comes in black. From there it was a matter of testing loads at the range with it. This gun is much easier to tote around in the woods than a 12, and gets the job done. Got my Merriam's this spring with it. So, yes I think the 21'' barrel in a 20 gauge would be a great option for anyone.