KAK HEAVY BOLT CARRIER EXTENSION

KAK HEAVY BOLT CARRIER EXTENSION

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KAK HEAVY BOLT CARRIER EXTENSION
$19.99
(10 reviews)
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Description

-STEEL 

-MANGANESE PHOSPHATE 

- SPECIAL APPLICATIONS FOR 9MM AND 45 ACP BUILDS WHERE  THE INTERNAL BCG WEIGHT MUST BE REMOVED 
3.89 OZ

-DIRECT REPLACEMENT FOR FACTORY MODEL AND CAN BE SWAPPED QUICKLY AND EASILY BACK AND FORTH .

-RETAINING O-RINGS AND BUMPER O-RINGS ARE INSTALLED


AR FOLDING STOCK ADAPTER NOT INCLUDED

DOES NOT WORK WITH THE SYLVAN FOLDER

Additional Information
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Reviews

  • 5
    KAK HEAVY BOLT CARRIER EXTENSION

    Posted by Robert on March 1, 2026

    Works as expected with my Law Tactical Folding Adapter. Added the extra weight needed, then the standard plug provided by Law Tactical.

  • 5
    KAK Bolt Carrier Extension

    Posted by Tommy Bandy on February 22, 2026

    My AR-9 functions flawlessly with the additional weight of the bolt carrier extension when paired with my folding stock adapter. Had problems when the USPS lost my first order, but KAK customer service came through with a rush replacement order. A+!

  • 5
    KAK Heavy Bolt Carrier Extension

    Posted by Lon Etchison on January 22, 2026

    Bought this so I could add a LAW folder to a PSA pistol. KAK shipped quickly. It was easy to install and well made. Took the PSA out last weekend and it ran like a scalded dog. Definitely recommend.

  • 5
    PSA AR-V 4" 9mm 1/10 Lightweight M-Lok MOE EPT SBA3 Pistol

    Posted by Robert on January 12, 2026

    I wanted to add more weight back to the BGC when I added the Law Tactical Folding Adapter. So far, over 500 rounds and no issues.

  • 5
    Great!!

    Posted by Leo on December 4, 2025

    Bought this for a law tactical folder on a AR9 build. Can confirm, this does work with PSA Gen 4 hybrid 9mm bolts.

  • 5
    Great product. I was confused at first of how it went in the bolt. I got it right the second time.

    Posted by Richard on November 6, 2022

    Using in a Aero AR15 9mm.

  • 4
    Not compatible with Sylvan Arms AR Folding Stock Adapter

    Posted by Brian on July 16, 2022

    This extension is apparently not compatible with a Sylvan Arms ARH300 AR Folding Stock Adapter and a 9 mm bolt with the weight removed. The bolt is not pushed all the way forward by the buffer and spring to fully chamber a round.

  • 5
    It’s works

    Posted by Timothy on January 12, 2021

    I’m running a law folder with a 4.5” 9mm set up. Works great added 2oz of buffer over my old pdw stock set up

  • 5
    Essential for 9mm LAW folder builds

    Posted by D. on July 8, 2020

    Using a LAW folder on a 9mm blowback required removal of the heavy internal bolt weight to make room for the LAW bolt extension stub in the hollow end of the bolt. The original extension stub weighs significantly less than the removed weight. This longer heavy extension brought the 9mm bolt back up to proper mass for blowback operation. Perfect fit and function. Thank you, KAK!