https://stream.echo6.co/videos/watch/62c5c654-2058-406e-b5a3-8340ed0a291d https://www.forgottenweapons.com/mosin-nagant-factory-pressure-test-rifle/ http://www.patreon.com/ForgottenWeapons Cool Forgotten Weapons merch! http://shop.forgottenweapons.com How did people determine chamber pressure in the years before computers and fancy electronics? Well, by squishing a calibrated slug of copper. Factories would convert rifles specifically for pressure testing use by adding a pressure ring around the chamber, drilling a hole in it, and then threading in a gage to crush a block of copper. This Mosin Nagant is an excellent example of the system, complete with the all the testing apparatus! Mon, 13 Apr 2026 20:44:31 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/62c5c654-2058-406e-b5a3-8340ed0a291d All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.