Advanced Technology Receiver Extension Buffer Tube 6-Position Mil-Spec Diameter AR-15 Carbine Aluminum Black
- Buffer tubes come either as Mil-Spec or Commercial diameter.
- The Mil-Spec buffer tube is 1.148" in diameter while the Commercial buffer tube is 1.168" in diameter.
- The standard is buffer tube diameter is Mil-Spec (1.148")
- Commercial stocks and buffer tubes are usually described as such.
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