That's awesome that you and your wife both have that interest in firearms. ADCO does barrel cutting,profiling, etc. You should look into their work for your ACR Diet plan.My wife wants an ACR now and her only complaint is the weight. I plan on having the barrel put on a diet and cut down to 14.5 with a p/a flash hider/suppressor mount. All the ounces will count for her.
ETA: Mine will most likely end up at 11 lbs or so.