Quick Tip: Installing the KNS AR / MCX Picatinny Stock Adapter

Published on June 29, 2022
Duration: 5:31

This guide details the installation of the KNS Precision AR/MCX Picatinny Stock Adapter on an AR-15 lower receiver. The process involves removing the standard buffer tube assembly and replacing it with a 1913 Picatinny rail, allowing for a wider range of stock and brace options. The installation requires careful alignment of the adapter insert and securing it with a provided screw and washer, noting the necessity of the flanged version for AR-15 compatibility.

Quick Summary

The KNS Precision AR/MCX Picatinny Stock Adapter replaces the AR-15 buffer tube with a 1913 Picatinny rail, enabling a wider range of stock and brace options. It's ideal for builds using uppers like the BRN-180 that don't need a receiver extension. Ensure you use the flanged version for AR-15s to retain the detent spring.

Chapters

  1. 00:04Introduction to KNS Adapter
  2. 00:14What the Adapter Does
  3. 00:32Compatibility and Use Cases
  4. 00:54Stock Options Enabled
  5. 01:09Installation Process Start
  6. 01:14Adapter Kit Components
  7. 01:32Preparation: Remove Buffer Assembly
  8. 01:56Installing the Adapter Insert
  9. 02:05Adapter Insert Orientation
  10. 02:22Adapter Insert Flushness
  11. 03:05Attaching the Adapter Plate
  12. 03:11Flanged vs. Non-Flanged Versions
  13. 03:53Securing with Screw and Washer
  14. 04:12Alignment of Adapter Components
  15. 04:31Final Tightening
  16. 04:43Completed Installation and Benefits
  17. 05:05Questions and Support

Frequently Asked Questions

What is the primary function of the KNS Precision AR/MCX Picatinny Stock Adapter?

The KNS Precision AR/MCX Picatinny Stock Adapter replaces the standard AR-15 buffer tube assembly with a 1913 Picatinny rail. This modification allows for a much wider selection of aftermarket stocks and braces to be attached to the firearm.

On which types of AR-15 builds is the KNS Picatinny Stock Adapter most beneficial?

This adapter is ideal for AR-15 builds using upper receivers that do not require a traditional receiver extension. Examples include the BRN-180 upper, CMMG 22 conversion kits, and FM Products uppers, which are designed to function without a buffer tube.

Are there different versions of the KNS Picatinny Stock Adapter, and does it matter for AR-15 installations?

Yes, KNS offers flanged and non-flanged versions. For AR-15 installations, the flanged version is essential as it retains the rear take-down pin detent spring. The non-flanged version is typically for bolt-action firearms.

What is the correct orientation and seating for the KNS adapter insert during installation?

The adapter insert should be threaded in by hand with the cut facing backward and the flat side inward. It should be adjusted so its outer edges are nearly flush with the receiver, ideally sitting slightly inward to maximize contact with the rail.

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