I understand what bump stocks do from reading up on them, but I haven’t found an explanation of how they work. They allow firing a semi-automatic weapon more quickly by using recoil to move the rifle back and forth (“bumping”) against the trigger finger. What I don’t understand is what is different in a bump stock compared to a regular stock. In my mind, I envision a big cartoonish spring in the bump stock that moves the rifle back forward after the initial kick from recoil. How does it work exactly?
In: Physics
Rather than ‘pulling’ the trigger, you basically point your trigger finger in a fixed position and push the gun into your finger.
The stock slides, and has play. No springs. You push forwards with your non-trigger hand, and pull backwards with your trigger hand. Recoil pushes the rifle backwards (deeper into the stock). This allows the trigger to reset and be ready to fire again. At which point the forward pressure from your non trigger hand reasserts and moves the gun forwards, pushing the trigger into your waiting trigger finger, firing the gun and setting off the cycle again.
Here’s a video showing one in operation, highlighting the sliding action. Notice the trigger and grip move relative to each other.
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