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Mensaje: <blockquote data-quote="federicobarbarroja" data-source="post: 346330">Mechanically and externally, the TT-33 is very similar to John Browning's blowback operated FN Model 1903 automatic pistol, combined Browning's short recoil principle with a much simpler hammer/sear assembly with an external hammer. This assembly is removable from the weapon as a single unit and includes cartridge guides that provide reliable functioning. The Soviet engineers did add several features, including locking lugs all around the barrel and made several alterations to make the mechanism easier to produce and maintain. Production even machined the magazine feed lips into the receiver to prevent damage and misfeeds when a distorted magazine was loaded into the magazine well.<a href="http://en.wikipedia.org/wiki/TT-33">http://en.wikipedia.org/wiki/TT-33</a></blockquote>