Comments by "" (@neutronalchemist3241) on "Astra 600/43: A Straight Blowback 9mm for the Wehrmacht" video.

  1. In the end, an Hi-Point slide weights only about 520 grams, and it's enough to delay 9mm +p and .45 ACP. The entire Astra 600 weights 1.08 kg, easily more than 500 grams are on the slide as well.
    2
  2. They are comparable (IE a Hi-Point 9mm has a factory 17 lbs spring, like that of a Glock 17). Contrary to what's often believed, the stiffness of the recoil spring has a negligible effect in delaying the opening of the action in a blowback gun, and a too stiff spring would close the slide too fast to give the mag spring time to lift the next round. It has to be noted that much of the "bulky" appearance of a Hi-Point is due to its slide being made of zamak3, with a density of only 6.7g/cm3. Steel is about 8g/cm3, so a steel slide would have about 20% less volume having the same mass. Infact the slide of the Astra doesn't seem that bulky.
    2
  3. An Hi-Point slide weights only about 520 grams, and it's enough to delay 9mm +p and .45 ACP. The entire Astra 600 weights 1.08 kg, easily more than 500 grams are on the slide as well.
    2