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Works exactly as it should, no fuss, doesn't change during use too, chrono'd within 5 fps at the end of a day of use (could be because of tempurature change) I get these with every WE GBBR I buy, having the ability to adjust the fps is awesome, pure awesome. Installing isn't the easiest thing, but it isn't too bad either, there are videos on how to install it that make it quite nice rather than having some poorly drawn instructions in another language. BTW, mine didn't come with instructions, but I've done several of these and I have it down.
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Submited By: David B.
