Simoon,
Since you are dealing with a Luger for shooting, I recommend that you purchase a new spring.
Unlike most gun springs, this spring spends its entire existence in a state of compression, and so is constantly under stress. A survey of parts breakage in Lugers which are used for shooting reveals that this spring is the part second most subject to breaking, behind ejectors and just ahead of extractors.
A used spring will be nearing the end of its useful life, and since authenticity is not your primary consideration a new spring will provide you with the peace of mind which comes with the knowledge that this spring is less likely to break in use.
It will also help you avoid the embarrasment of having the lever unlock and your sideplate fly off under fire. When this happens, if you are lucky, you will be able to retrieve it before anyone else notices (if you are -really- lucky it will not fall in front of the firing line!).
Buy a new spring and save yourself the trouble.
--Dwight
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