Carbine gas system refers to the length of the gas tube and placement of the gas port on AR-15 and AR-10 barrels, typically measuring about 7 inches from the barrel extension. It is designed for use with carbine-length barrels (usually 14.5″–16″) and is compatible with carbine gas tubes, gas blocks, and related upper receiver components. Carbine gas systems are popular for their reliability and are commonly found on standard AR-15 carbines and many AR pistols.
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