Have you looked at the savage model 16 lightweight hunter? Theyre a discontinued model, but there are still some available in .223 on buds. Theyre 5.5 lbs and really [beeep] accurate. I have one in .243 and was so impressed with it i bought another in .308. Would really like to get a .223 also while theyre still available. And the 16lwh has an 8 twist, unlike all the new savage .223s are a 9 twist. With my .308 and a 3-9x33 vx2 ultralight scope shooting factory ammo my first 4 shot group at 200 yards was just under 1/4". Pretty awesome to have a gun that shoots like that and weighs in just a hair over 6 lbs, gun, scope, rings and brake.The .243 shoots [beeep] near as good. I would expect the same from the .223.
Just my thoughts, theyre awesome super lightweight guns, cant recommend them highly enough.
Edit: just looked at buds theyre out of stock. Guess i waited too long.