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What is necessary to switch the A2 stock on my SCM model? Are stocks interchangeable?

Does the UBR come with everything I need?

Brownells indicated I need an M4 buffer and spring.
 

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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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