W+F Bern P47 Experimental Gas-Delay Pistol

Published on July 29, 2017
Duration: 8:29

This video provides an expert-level overview of the rare W+F Bern P47 experimental pistol from 1947. Instructor Ian McCollum details its development as a potential Luger replacement, its unique gas-delay blowback system inspired by Ole Krag's patent, and its complex internal trigger mechanism. Despite its high manufacturing quality and promising performance, it lost the Swiss military contract to the SIG P210.

Quick Summary

The W+F Bern P47 is a rare 1947 Swiss experimental pistol featuring a unique gas-delay blowback system. Developed as a Luger replacement, its design uses gas pressure to delay slide operation until the bullet leaves the barrel, a system patented by Ole Krag.

Chapters

  1. 00:00Introduction: Bern P47 Experimental Pistol
  2. 01:52Field Stripping and Internal Mechanics
  3. 04:06Gas-Delay Blowback System Explained
  4. 06:59Military Trials and Legacy

Frequently Asked Questions

What is the Bern P47 experimental pistol?

The Bern P47 is a rare Swiss prototype military pistol developed by the W+F Bern factory in 1947. It was designed as a potential replacement for the Luger and featured an innovative gas-delay blowback system.

How does the gas-delay blowback system on the Bern P47 work?

The P47's gas-delay system uses gas ports in the barrel to bleed pressure into a cylinder, pushing a piston forward. This action keeps the slide locked until the bullet has exited the barrel, delaying the blowback cycle.

Why was the Bern P47 not adopted by the Swiss military?

Although the Bern P47 performed well in tests, it ultimately lost the Swiss military contract to the SIG P210 (P49), which was considered a superior design by the military authorities.

What is unique about the Bern P47's trigger mechanism?

The P47 has a complex 'mouse trap' style trigger mechanism that is entirely contained within the pistol's frame, accessed by removing a side plate under the grip panel. This differs from many other contemporary designs.

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