The external dimension of an aftermarket, heavier-profile barrel for the Ruger 10/22 rifle typically measures around 0.920 inches at the muzzle end. This increased thickness distinguishes it from the factory standard barrel, which has a considerably slimmer profile. This difference in size is a key characteristic.
A barrel with increased external dimension offers several advantages. The increased mass aids in heat dissipation during rapid firing, helping to maintain accuracy. The additional weight also contributes to improved stability and reduced muzzle rise. Historically, such barrels have been popular upgrades for target shooting and varmint hunting applications where precision and consistency are paramount.