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What Barrel Length Is A Carbine? [Solved]
For the most part, a rifle with a barrel shorter than 20 inches can be called a carbine. If the barrel length is less than 16 inches, it is also a short-barreled rifle (SBR) and is regulated by the National Firearms Act (NFA).
AR rifle gas systems and barrel lengths explained
A brief discussion on the three common AR-15 gas system
carbine vs mid length
A look at a 14.5''
Optimum Barrel Length?
This general guide for a precision bolt action
