I noticed online a vendor offering a 16-1/2" barrel for the Ruger 10/22 in a 1 in 9 twist, stating that is was for subsonic 22LR ammo including Aguila 60gr. ammo. I'm looking for comments--pro or con on this barrel. I rarely shoot anything other than standard or "subsonic" anyway. Are these barrels as accurate as a 1 in 16" when using subsonic ammo?