Barrel has polygonal rifling and is chrome lined, and solidly attached to the frame. The frame and the slide is made from carbon steel with special high-strenght finish. GB also featured firing pin block that unlocks the firing pin only when the trigger is completely depressed. The trigger of the GB is of double action design, with the slide mounted decocker lever. The gas brake is formed by the barrel, its bushing and the slide. This scheme was developed by German engineer Barnitzke at the end of the WW2. It uses some of the hot powder gases, feed from the barrel into the front part of the slide, to slow down the retraction of the slide before the bullet leave the barrel. The GB is a blowback-operated, gas-retarded blowback semi auto pistol. Which is best for you? The Steyr is favored by most special forces teams.
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