the G&P kit comes with the part that the guarder needed to be modded so you can switch back to the marui parts if you want
they are essentially the same design with G&P being less expensive and comes with that part and a metal outer barrel
I heard the opposite that the G&P slide is a tight fit and kind of sticks making it have a very unsmooth cycle action
also heard that the trades are not as deep as the Guarder ones
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