I've taken apart several hundred WE pistol hop ups. WE hop up screws are some of the shittiest screws you'll ever find, some of them come stripped from the factory.
1. Always use the correct bit, apply lots of pressure to ensure it does not slip.
2. If you feel it slipping, don't continue the same way. You will strip it.
3. If it is stripped, hammer in a small flathead, the screws are soft and the flathead should be roughly the same size as the hole.
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