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Utilizing the Locking Optimized Components (LOC) lettering system, which identifies the four caliber families, all of the interchangeable LOC components are clearly labeled for quick and convenient assembly. The Dimension's barrel, bolt, magazine and magazine housing are all marked with LOC letter designations (A, B, C, D) which, when matched and installed on the receiver, insure that the caliber marked on the barrel can then be shot from the rifle. When converting to a caliber within the same letter family, only the barrel needs to be changed. In order to modify the rifle into a caliber outside of a letter family, the bolt, magazine group and barrel are all changed to the corresponding label. The Dimension platform will initially be available in 10 different calibers, which are categorized into four letter families. The barrels are all standard with 5R rifling, which maintains accuracy and helps to reduce copper fouling and cleaning times.