The safety switch on the top tang of your firearm also serves as the barrel selector. The barrel selector allows you to choose which barrel will fire with the first pull of the trigger. The other barrel will then fire with the second pull of the trigger. The safety must be in the "on safe" rearward position to operate the barrel selector.
On the left side of the safety switch is the letter "U" which stands for UNDER. On the right side is the letter "O" which stands for OVER. The safety itself can be moved to the right or left covering and uncovering the letters.
• If the letter "U" is exposed, the under (lower) barrel will fire first (Figure 5A).
• If the letter "O" is exposed, the over (top) barrel will fire first (Figure 5B).
Often different chokes are installed in each barrel which have different constrictions. This may make one choke more preferable for a certain shot. Also there is slightly less muzzle jump when the lower barrel is fired first, making it easier to pick up your target for a follow-up shot. The barrel selector allows you to choose the best choke and firing order combination for changing hunting conditions or to adapt to the layout of a sporting clays station.
Always make sure that the selector switch is completely to one side or the other. If the switch is inadvertently positioned directly between "O" and "U" the safety switch may be more difficult to move forward to the "off safe" position.
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