AR15 9MM Carbine Extended Buffer, 8.4 oz

(12 reviews)
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Extended length for proper bolt catch overtravel  

Length- 4"

Weight- 8.4oz

Buffer weights- 3 Steel 1x Tungsten

Finish– Phosphate

Bumper color- Gold

Compatible with regular buffer tube spring

For use with 9MM Pistol Caliber AR15 firearms utilizing a one-piece BCG



  • 4
    KAK 9mm Carbine Extended Buffer 8.4 oz Reciprocating Weights

    Posted by MichaelH on March 26, 2024

    Received and installed in relatively reliable FM 9 that came stock with a 6.5oz steel extended buffer. Selected this to eliminate possibility of bolt bounce. Need some more time to see if this increases reliability, but high speed photo of bolt released by bolt catch show's no discernible rearward movement when loads a round into battery, which was the point. Will update if use reveals something negative or exceedingly positive.

  • 5
    Kak 9mm buffer

    Posted by Scott Jelinek on March 26, 2024

    I got the kak 9mm buffer and my 9mm ar has been running great with 500 rounds through it I have only had 2 malfunctions and they were both mag related. 5 stars!

  • 5
    AR15 9mm Carbine Extended Buffer

    Posted by John Frederick McIntire on March 18, 2024

    Great product works well and has reasonable price with fast shipping.

  • 5
    Works great for me

    Posted by Jack Messersmith on December 21, 2023

    This is my first build and the first AR style rifle, so take this however you wish. I used this buffer in combination with the AR-15 MIL-SPEC CARBINE BUFFER TUBE and a Wilson Combat flat wire spring. This combination worked great. Not a single malfunction at all others than the LRBHO didn’t engage every time. This was not the fault of the buffer. I’m happy with it. Recoil is less than I expected from what I’ve read about 9mm PPC’s and recoil.

  • 5

    Posted by Dave on December 14, 2023

    This is just what my AR-15 9mm pistol needed. Not only did it reduce recoil and muzzle rise but second and third shots were right on target with minimal effort.

  • 4
    Good buffer

    Posted by Jacob on November 23, 2023

    Got this buffer to get my buffer and bcg to be over 22 Oz for my epc9. So far so good, but haven’t had many rounds through it yet.

  • 5

    Posted by Ignacio on September 25, 2023

    Worked like a charm. Solved my issues!

  • 5
    PCC Buffer

    Posted by Craig Thompson on July 31, 2023

    This buffer & regular carbine spring Solved 90-95% of my 10.5” PCC Build issues. Got another for my 16” and it’s running flawless now too. Heavier, reciprocating buffer & lighter spring was exactly what was needed to smooth out the weapons.

  • 5
    Perfect 9mm buffer for the BCA 9mm right side charge

    Posted by Joseph Syrnichenko on June 18, 2023

    Exactly the right length and weight for my BCA right hand charge to run perfectly. With a sprinco blue spring there's zero hiccups even running full speed binary