I don't have the spec/weight differences of before and after but I did the very thing you are thinking about doing. I sent my RRA 16" heavy mid length barrel to ADCO. Had it shortened to 14.5, re threaded, government profiled under the hand guards, and refinished. Cost was right at around $175 shipped door to door from Tennessee. I also purchased a YHM Phantom FH and did the perm attach myself (not included in that $175 btw) The balance and handling benefits I could feel were well worth it in my opinion. Accuracy didn't change at the ranges I shoot at. Looks wise for my build - it just
looks right with the shorter barrel. This thing was heavy as shit before.
Also, I don't know how long of a rail you bought so I'll say this much. The rail you see here is a 12" Daniel Defense Lite Rail. You can see in the first pic that I had a cheapo Promag vertical foregrip mounted before and now the rifle sports a Magpul AFG.
THAT makes a HUGE difference in how the rifle feels and handles IMHO if you are in to that sorta thing.
Would I do it again if needed? Oh yes!
Will I consider things like that first before I buy my next upper so I don't have to drop money into a barrel again? You bet!
Hope this helps some. If I were you I'd just keep it and send it to ADCO. Thats the deal with building ARs, you always change things, new products come out and sometimes you have to go backwards.
WELCOME TO ARFCOM
BEFORE
AFTER