"...carbine is used mostly by my wife when..." How are you getting the ATT? Rumour has it that ATT's for restricted rifles are not being issued.
"...why not..." Buggers up the balance. An Aimpoint wouldn't be too bad, weight wise, but carbines don't balance well with a scope. Won't make it shoot any better either.
Had 5 thou removed from either side of the front sight on mine after not being able to see bowling pins at Second Chance, long ago. Should have used my handloads instead of the milsurp ball I bought. Of course, poverty set in and never got the chance to see it it made any difference before the rectal orifi came up with this permit nonsense. Shoots extremely well with Speer 110 grain HP's and IMR4227. 13.5 to 15.0(compressed). Mine likes 14.5 grains. Makes a fabulous BARK! sound too. The 110 grain HP blows a hole the size of a grapefruit in a ground hog. Had more fun hunting with my Plainfield and its iron sights than any other rifle.