Before Getting That KES MP5 Collapsible Stock Know How Many Pins

Published on January 1, 2026
Duration: 9:38

Walter Keller from Safety Harbor Firearms provides expert guidance on selecting and installing the KES MP5 Collapsible Stock. The video emphasizes the critical difference between 1-pin (full-size) and 2-pin (K-model) MP5 receivers, which dictates stock compatibility. It also details how manufacturing tolerances in sheet metal receivers can affect fitment, with a preference for a snug, wobble-free installation, even if it causes minor finish wear. Proper use and avoiding damage from 'dry firing' the stock are also highlighted.

Quick Summary

When selecting an MP5 stock, the critical factor is the receiver's pin configuration: 1-pin for full-size models and 2-pin for K-models. Manufacturing tolerances in sheet metal receivers can lead to tight fits with aftermarket stocks like the KES, which is intentionally designed for a snug, wobble-free installation, even if it causes minor finish wear. Always verify your receiver type before purchasing.

Chapters

  1. 00:00Introduction to MP5 Stocks
  2. 00:411-Pin vs. 2-Pin Receivers
  3. 01:31Identifying Your Model
  4. 02:26Fitment and Manufacturing Tolerances
  5. 03:51Finish Wear and Tightness
  6. 05:11Proper Use and Maintenance
  7. 06:26Comparison with Factory Caps

Frequently Asked Questions

What is the main difference between MP5 receivers that affects stock compatibility?

The primary difference is the number of mounting pins at the rear of the receiver. Full-size MP5 models and their clones typically use a single (1-pin) mounting point, while compact MP5K models require two (2-pin) mounting points for stock attachment.

Why might an aftermarket MP5 stock like the KES feel tight during installation?

MP5 receivers are made from bent sheet metal, leading to variations in dimensions. Aftermarket stocks, especially those designed for precision like the KES, are built to tighter tolerances, which can result in a snug fit due to receiver width or paint thickness.

Is it normal for an MP5 stock installation to cause finish wear on the receiver?

Yes, a snug fit is preferred to eliminate wobble and ensure a stable platform. This tight tolerance, while beneficial for function, may cause minor cosmetic wear on the receiver's finish, which is considered acceptable by manufacturers like Safety Harbor Firearms.

What is a common mistake to avoid when buying an MP5 stock?

A common mistake is ordering the wrong stock version. Users must verify if their firearm is a full-size (1-pin) or K-model (2-pin) receiver before purchasing, as many clones exist under various brand names, leading to confusion.

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