medium weight barrel

Hello All, I bought a Springfield Scout Squad and was looking at putting a sage chassis on it in the future, at the certified dealers it asks medium or heavy barrel and have searched around and can't find a definite answer to which it would be, I assume it would be a medium barrel and that heavy...

Hi Guys, TL:DR, should I get a medium weight barrel for my standard M1A to improve accuracy? I have the Standard Walnut M1A from Springfield (22", 1:11 Twist, Parkerized). I primarily use this rifle for target shooting on a bench (steel or mainly paper at 100-300 yards) with 168gr Match ammo...