often the replicas are the characteristic "Hop-Up", which as most probably know, is a small rubber device that allows the mirror to have a broader scope creating a small effect parable. But how does the Hop-Up?
This is the inner barrel of an M4. The copper-colored side on the right is the cannon that extends to the muzzle of the replica. The part that the image is held by the thumb, is the feed hole where the bb's up from the magazine. The gears are the Hop-up mechanism. Through the center gear is black, got to move the other pieces. Inside the canyon there is a small rubber (the hop-up) that drive the wheels, we can more or less protruding on the inside.
When the Hop-Up found in the "rest position", ie its original position, the barrel is completely smooth. Thus the bb goes in a straight line projected by the barrel. 
If instead, we adjust the Hop-Up, (pictured is the small black lump inside the pipe) causes the rubber, plastic, when in contact with this "hook" in momentaniamente his career. Thus, bb, leaving the canyon begins to turn on itself and up. For example, if a soccer ball held between the hands, we would shoot ourselves. This causes contact with air, the ball up just after out of the canyon. When you have traveled a few yards, the ball loses this effect by the friction of the air and falls again. Thus, we get some shots in a parable, is well calculated, can impact directly on our private center looks. 
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