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Dennis, The Thompson/Center Compass™ Bolt-Action Rifle features a match-grade barrel with 5R rifling that minimizes bullet jacket deformation and jacket fouling in the grooves.

Dennis, this is Thompson's list of 5R rifling Compass Models. Just match the Model number to the caliber you want : ---- https://www.tcarms.com/firearms/bolt-action-rifles/t-c-compass-rifles/t-c-compass-ii