When you install a Gov't. barrel in a Commander you will most likely run into having to shorten the front side of the bottom lugs (the guide rod in a Comander sits further to the rear than a Gov't model) and turn back the large O.D. of the barrel just ahead of the top locking lugs (for bushing clearance)in addition to shortening the front.
Can I put a 5" govt barrel on a 4.2" commander frame ? It seems to fit fine, slide releases and comes home smoothly , all seems well, wondering if safe to shoot, same slide and recoil, just longer barrel poking out...
Why would you want to give your 1911 commander a woody? Ever seen a Glock 26 with a restricted barrel? No thanks.