CMC AR-15 Mil-Spec Enhanced Buffer Tube Assembly Kits

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Looking to build the ultimate AR-15 carbine? This Mil-Spec carbine buffer tube kit from CMC Triggers comes with everything you need to attach a collapsible 6-position carbine stock to your AR. The Mil-Spec buffer tube is made from aluminum and the recoil spring is made from stainless steel. When paired with a carbine length gas system, this buffer assembly will provide exceptional reliability and durability. The enhanced buffer tube also has a lip on the bottom that extends further into the lower receiver, providing more strength to prevent it from breaking. Simply thread it into any Mil-Spec AR-15 lower receiver and is compatible with a large variety of aftermarket buttstocks. The included castle nut and lock ring ensure that the buffer tube will not back off over time. It also includes a QD receiver end plate for attaching your favorite sling. The spring and buffer weight are tuned specifically to .223 and 5.56 caliber rounds and will not work with .308 rifles. Finish your AR-15 build with this complete buffer tube assembly today.


  • Carbine length aluminum extension tube
  • Standard .223/5.56 rifle stainless steel buffer spring
  • Standard .223/5.56 buffer weight
  • Castle Nut
  • Lock ring
  • Receiver end plate with QD sling swivel slots

WARNING This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to (California law requires this warning to be given to customers in the State of California.)

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Additional Information

Product ID:
Buffer Tubes
Made In USA
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