AR 15 / Magpul Spring Question

The_Red_Rabbit

CGN Regular
Rating - 100%
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Location
Toronto
Hello,

Today I was fitting a Commercial Spec Magpul Buttstock to my new Norinco CQA. The fit was very tight so I took the latch off the Magpul stock and reinstalled it after I put the stock on. I have disassembled Mil Spec Magpul before but I could not figure out what this spring is for. Any ideas?
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Thank you!
 
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