The basic answer is no, it won't work. There are a couple reasons for that too. First and foremost is that its not legal. The lightning link is made and registered for use in the AR lowers and I think its limited to the AR15's as well. This means its not legal to use in a weapon other than what its intended for....ie no use in SIG's , FN's etc.
Secondly and also very important, the trigger group in the SIG is completely different than the AR so the link won't fit the lower or the trigger parts. The whole operating system is different.
Hope that answers the question.
Frank
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