Foxtrot Mike Products AR-15 9mm Heavy Buffer

Manufactured by Foxtrot Mike Products
3 Reviews


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Building an AR-15 in 9mm comes with some unique challenges. With a simple blowback system, it is important to choose a buffer weight and buffer spring that are properly tuned to the 9mm Luger round. The Foxtrot Mike Products FM-9 heavy pistol buffer has been extensively tested to ensure that it is the correct weight to reliably cycle any AR-9 pistol action. The heavy buffer has an extended length to negate the use of a spacer and reduces wear on the bolt catch to prevent breakage after a long period of time. The heavier weight slows down the bolt resulting in less felt recoil and a slower rate of fire, making your 9mm carbine much more enjoyable to shoot. It is coated in a salt bath Nitride Melonite/QPQ finish, which gives it excellent corrosion resistance and lubricity for an extremely smooth action. If you are looking to build an AR-15 pistol or pistol caliber carbine chambered in 9mm, don’t skimp on the buffer weight. It is one of the most important components to keep your firearm running reliably.

  • Compatible with all pistol caliber AR-15 upper receivers
  • Designed for pistol length buffer tubes
  • Salt bath Nitride Melonite/QPQ finish gives lubricity and wear resistance
  • Extended length improves cycling and reliability
  • Heavy 6.4 oz. weight reduces rate of fire and felt recoil
  • No spacer required
  • Made from 4340 steel
  • Made in the U.S.A.

Feature rich, high-quality, and affordable, Foxtrot Mike Products offer cutting edge solutions utilizing the highest quality materials and manufacturing processes available.


BrandFoxtrot Mike Products
Weight6.4 oz.

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

3 reviews

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Dropped this in a PSA lower!


You can tell the difference as soon as you pull the charging handle. The stock setup worked but this is just a tighter feel and much nicer buffer. Hats off.

Works Great for my AR-9mm build!

by -

Recommended by PR and works Great in my AR-9mm build. Even with a binary trigger! I would recommend this product!

High Quality!

by -

This 6.4 Oz buffer cycles perfectly in my 5 and 7” uppers! High quality for a great low price!