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hey, i just checked, there is a Allen screw, but is so small (about 2mm in diameter) so it just looks like a circle, but i stuck a Allen key in and it is a Allen screw, i turned it clock wise till it couldn't go any more, but since i don't have a chronograph im not sure if their is a FPS change, and i don't seem to see a difference form other shots i made, if their was a increase it wasn't dramatic enough that i could see.
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