strongly recommend just pushing the pin out and not trying to unhook the bottom of the foregrip. Once the pin is out the bottom will shoot off with a long spring attached to it.
When putting it back together put the foregrip in place, slide the spring into the grip far enough so the pin goes through it and the body of the gun, put the pin in then use plyers to pull the spring out of the foregrip bottom and hook it onto the plate at the bottom of the foregrip.
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