Before Getting That KES MP5 Collapsible Stock Know How Many Pins

Published on January 1, 2026
Duration: 9:38

This guide details the installation of the KES (Kompressor Entry Stock) on MP5 and MP5K platforms, emphasizing the critical distinction between 1-pin and 2-pin receivers. It highlights potential fitment challenges due to manufacturing tolerances and advises on proper installation techniques to achieve a snug, stable fit without damaging the firearm. The guide also includes a crucial warning against improper stock manipulation that could lead to component damage.

Quick Summary

When installing an MP5 KES collapsible stock, the primary consideration is the receiver's pin count: 1-pin for full-size MP5s and 2-pins for MP5K models. Expect a snug fit due to manufacturing tolerances, which ensures stability but may cause minor finish wear. Avoid forcefully slamming the stock open to prevent internal damage.

Chapters

  1. 00:00Intro: Choosing MP5 Stocks
  2. 00:411-Pin vs. 2-Pin Receiver Difference
  3. 01:31How to Identify Your MP5 Model
  4. 02:26Fitment & Manufacturing Tolerances
  5. 03:51Tight Fit vs. Finish Wear
  6. 05:11Proper Stock Use & Maintenance
  7. 06:26KES vs. Factory End Caps

Frequently Asked Questions

What is the main difference to consider when buying an MP5 collapsible stock like the KES?

The most critical factor is the receiver's pin configuration. Full-size MP5 models use a single mounting pin (1-pin), while compact MP5K models require two mounting pins (2-pin). Ensure your stock matches your firearm's receiver type.

Why might an MP5 KES stock be difficult to install?

MP5 receivers are made from bent sheet metal, leading to variations in dimensions. Factors like receiver width or paint thickness can cause a precision-machined stock like the KES to fit very snugly, potentially requiring firm pressure or a mallet.

Is it okay if a new MP5 stock wears down the receiver's finish?

Yes, a tight fit is often preferred for stability and eliminating wobble, even if it causes some cosmetic wear on the receiver's finish. Manufacturers like Safety Harbor Firearms intentionally design their stocks for a snug fit.

How should I avoid damaging my MP5 collapsible stock?

Avoid 'dry firing' the stock by repeatedly slamming it open with excessive force. The firearm's weight can cause damage to internal components not designed for that specific type of stress.

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