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Best hop-up for the M4/M16 line in my opinion. They used to charge the same just for the strike chamber (the orange parts it comes with, top hop-up arm and gear), and it was still worth it, but now you get the hop-up as well.
The strike chamber makes it easier to fine-tune the hop-up, and makes it so it doesn't slip backwards as well.
You'll need the lower 2 gears from your existing hop-up to make it work.
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