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UK activists break into israeli weapons factory and smash it up.
(streamable.com)
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For what it's worth they did smash quite a few drones and other war-crime equipment. Lighting the place ablaze would be more effective, though that would likely land them heavy prison sentences.
Unscrewing everything they can get to (and destroying the screws/bolts/fasteners) would also be very effective. It's easy to justify replacing destroyed equipment, but working equipment that needs to be thoroughly re-inspected for sabotage takes time.
It would also give you access to stuff that's much easier to smash up.