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A gas electron multiplier (GEM) is a type of gaseous ionization detector used in nuclear and particle physics and radiation detection.. All gaseous ionization detectors are able to collect the electrons released by ionizing radiation, guiding them to a region with a large electric field, and thereby initiating an electron avalanche.
A bump stock causes the trigger (red) to be actuated when the receiver moves forward, being reset each round by receiver recoil. This allows semi-automatic firearms to somewhat mimic fully automatic weapons. Bump fire stocks are gun stocks that are specially designed to make bump firing easier, but do not make the firearm automatic. [9]
The Verneuil method (or Verneuil process or Verneuil technique), also called flame fusion, was the first commercially successful method of manufacturing synthetic gemstones, developed in the late 1883 [1] by the French chemist Auguste Verneuil.