if you had a solenoid you would not need the spring just use a connecting rod directly to the piston solenoid. if you used a solenoid to compress the spring you would have to engineer some sort of sear to release the spring, there is no way that a solenoid would be able to keep a spring tensioned for any amount of time with out draining your battery in about 10 seconds. also I may be wrong but I don’t believe you would be able to make the gun full auto it could possibly work in a sniper rifle.
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