AR-9 w/Drop In (SuperSafeSolutions) 10oz Kak Buffer, Heavy Bolt Weight, 3 pos selector- She's Alive!

Published on November 4, 2025
Duration: 3:00

This video demonstrates a crucial modification for AR-9 builds: swapping out the stock buffer for a heavier one, specifically a 10oz Kak buffer from a Super Safe Solutions build. The presenter highlights that the initial test firing revealed the firearm would not run in full-auto without this heavier buffer, indicating its importance for proper cycling and reliability in AR-9 platforms. The process involves a simple buffer and spring replacement, emphasizing that this 'drop-in' solution can resolve operational issues.

Quick Summary

A heavier buffer, such as the 10oz Kak buffer used in this AR-9 build, is often essential for reliable operation, especially in full-auto. The stock buffer was insufficient, causing cycling issues. This simple drop-in modification from Super Safe Solutions components resolved the problem.

Chapters

  1. 00:00Introduction: AR-9 Build Overview
  2. 00:07Initial Test Fire with Stock Buffer
  3. 01:06Identifying the Need for Buffer Change
  4. 01:11Stock vs. Heavier Buffer Comparison
  5. 01:40Installing the 10oz Kak Buffer
  6. 01:45Second Test Fire: She Runs!
  7. 02:14Functionality Confirmed: Safe, Semi, Full Auto
  8. 02:23Conclusion: Drop-in Solution for AR-9 Reliability

Frequently Asked Questions

Why did the AR-9 fail to run in full-auto?

The AR-9 likely failed to run in full-auto due to an insufficient buffer weight. The stock buffer was too light, preventing the bolt carrier group from cycling correctly to achieve automatic fire. Upgrading to a heavier buffer, like the 10oz Kak buffer, is often necessary for reliable operation.

What is the benefit of a heavier buffer in an AR-9?

A heavier buffer in an AR-9 helps to slow down the bolt carrier group's rearward travel. This controlled movement is crucial for proper extraction, ejection, and feeding, ensuring reliable cycling, especially in semi-automatic and fully automatic modes. It can also help reduce felt recoil.

What parts were used in the AR-9 build?

The AR-9 featured a PSA upper receiver and an Andro Corp lower receiver. The modification involved swapping the stock buffer for a 10oz Kak buffer, which was originally part of a 'Super Safe Solutions' build.

Can a drop-in buffer fix AR-9 reliability issues?

Yes, a drop-in buffer upgrade can often resolve AR-9 reliability issues. As demonstrated, switching from a lighter stock buffer to a heavier aftermarket buffer (like the 10oz Kak) can ensure proper cycling and function, making it a simple yet effective modification.

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