A 12.5″ barrel length is popular for AR-15 pistols and short-barreled rifles (SBRs), offering a balance between compact size and improved ballistic performance over shorter barrels. This length works with carbine-length gas systems, compatible gas blocks, gas tubes, upper receivers, and mid-length or short handguards. It’s suitable for calibers like 5.56 NATO, .223, and 300 Blackout, providing reliable cycling, better velocity, and accuracy in compact AR-platform builds.
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