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!
All three volumes available worldwide from: http://www.kalashnikov-encyclopaedia.com While there are several books available which showcase a decent number of different Kalashnikov variants (like Tokoi’s work), and there are good reference works on the history and […]