Probably would affect it. Would be a matter of positioning the switch in the right spot so the follower will definitely go by it.
Maybe there's another solution which would depend on an event which only occurs when the mag is empty. Say an optical sensor somewhere to sense if a bb is shot out of the inner barrel? When there's no bb it shuts off until it is reset via the bolt-catch. Of course this all requires wiring etc...
So what specific events happen when you run out ammo?
Sound signature changes
No bbs are expelled
No bbs are fed into hop.....This is all brainstorming.
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Various BB throwers
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