can anyone tell me what the velocity difference is generally between a 12.5 inch barrel and the 13.7 inch barrel , 5.56mm ?? is velocity difference worth the longer barrel ? I notice the new UK ranger rifle (knight armament) is a 13.7 inch barrel.
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can anyone tell me what the velocity difference is generally between a 12.5 inch barrel and the 13.7 inch barrel , 5.56mm ?? is velocity difference worth the longer barrel ? I notice the new UK ranger rifle (knight armament) is a 13.7 inch barrel.
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