do it!!!! you will never look back, and you will be hard pressed finding better service or components.. the barrel should be fine, the lock is the right one beyond any doubt.. i have the round face and the early virginia and i like the early virginia better.. they are interchangeable , the round face has a water proof pan.. this couses the powder amnount to be less.. the early virginia has mucho powder, great ignition and a large flint in a lock that can be knapped in the gun when pressed for time in the field or at the range.. the lock will be timed by jim himself and will be the heart of the gun,, and the best way to go when aiming, holding and squeezing trigger, looking to bag moving game.. you should get 25 plus hassel free fireings with this setup if you do it right.. i shot 25 rounds two weeks ago at the sporting clays range, no lag in ingition, no napping, no missfires, one flint... top knotch stuff.. the white lighning flash hole tops it off.. get the best stock yo can aford.. you will be guaranteed a fine product.. i like the big locks best for hunting guns when weather etc is entered in.. another option would be the mark silver in a special order 16 guage getz barrel.. .. very nice, is what i have but is heaveier about 8 3/4 pounds..and maybe up to a six months wait or more for barrel.. ive shot lots of ducks with it.. and i shoot skeet, trap and sporting clays.. if you want the 20 go for it.. good luck.dave..