phone: 888-310-0284

AR-9 Pistol Buffer Tube Kit - 5.4oz (9mm) Buffer

Usually ships the same day or the next business day!

Reduce recoil and dial in your AR-9 build the right way.

The 9mm cartridge utilizes blowback functionality to cycle in the AR platform. That means no gas system's required. But that also means the recoil impulse -- and the energy imparted on the bolt carrier -- can be excessive if you're running a standard AR-15 buffer.

This AR9 Pistol Buffer Tube Kit provides the appropriate heavy 9mm buffer (5.4 ounces) to reduce felt recoil and improve handling and accuracy.

9mm Buffer Kit: What's Included

  • 5.4-oz. 9mm buffer
  • buffer recoil spring
  • mil-spec buffer tube (fits AR-15, AR9 receivers)
  • Standard castle nut
  • Standard latch plate


WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to:

Shipping Restrictions

Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily. only ships within the United States. Federal legislation dictates we cannot ship our products internationally.


We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.