PTR K3P (G3K) Project Gun

Published on March 25, 2024
Duration: 10:51

This project gun build focuses on the PTR K3P, a 12-inch barreled G3K variant. Key modifications include upgrading the trigger pack housing and safety selector for better ergonomics, and installing an M-LOK rail. Critical technical adjustments involve replacing the stock 55-degree locking piece with a 50-degree one to prevent receiver damage, especially when suppressed, which can increase bolt velocity and cause 'roller dent'. Optic selection is also crucial, as wide optics can interfere with ejection.

Quick Summary

The PTR K3P project gun requires a 50-degree locking piece instead of the stock 55-degree one for its 12.5-inch barrel to prevent self-damage. Suppressing it increases bolt velocity, potentially causing receiver 'roller dent', necessitating lower-degree locking pieces (45-36 degrees). Optic width is critical to avoid ejection port interference.

Chapters

  1. 00:00Intro: PTR K3P Project Gun
  2. 02:54Technical Specs: Locking Piece Importance
  3. 04:37Furniture & Accessory Upgrades
  4. 06:09Optic Compatibility Issues
  5. 08:08Suppression & Internal Tuning

Frequently Asked Questions

What is the main technical issue with the PTR K3P's factory configuration?

The PTR K3P often comes with a 55-degree locking piece, which is incorrect for its 12.5-inch barrel. This can lead to the firearm damaging itself over time. A 50-degree locking piece is recommended for proper function and longevity.

How can optic choice affect the PTR K3P's reliability?

Wide optics, like the EOTech XPS series, can interfere with the ejection port on the PTR K3P. This interference can cause malfunctions by preventing spent casings from being cleared properly. Narrower optics or different mounting positions may be necessary.

What are the risks of suppressing a PTR K3P?

Suppressing roller-delayed blowback firearms increases bolt velocity. This can cause 'roller dent' damage to the receiver. To mitigate this, using an even lower-degree locking piece, such as 45 or 36 degrees, is advised when shooting suppressed.

What ergonomic upgrades are suggested for the PTR K3P?

The video suggests upgrading the trigger pack housing to a Magpul version and installing an ambidextrous safety selector. These modifications aim to improve the overall ergonomics and handling of the firearm.

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