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Stock Replacement Help Magpul UBR

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flascot007

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You do not need the buffer spring, that is for the AR only. You have a Sig and it is a totally different system. The UBR has all you need. I have installed several on the SIG. Word of note! be careful not to loose the spring and ball behind buffer plate. It operates the locking detent for your rear receiver take down pin.
 
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flascot007
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