Part one. Do the other 3 bolts up tight.
Part two. Use a solid screwdriver. No little thumbwheel ones.
Part three. Clamp or secure the receiver so you can use 2 hands on the screwdriver.
Part four. Lean your weight with your palm on the driver so it can't cam out of the head and slowly wind out the damaged screw. Throw it out so you're not tempted to use it in a pinch. You'll have 3 good ones to use as comparison.
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Airsoft, where nothing is hurt but feelings.
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