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OK. From what you are talking about, I presume that you are going to purchase a SIG pistol and add a stock to it. This requires a Form 1, which is application to make an NFA weapon. Bear in mind that you will need to make application to, and receive approval from, BATF before you can procede with the conversion. Cost is $200.00
The Form 4 is the form that you use to actually purchase an NFA item, such as your silencer. It is also submitted to BATF for approval. That is something that whomever you use to do the transfer of the silencer will provide to you, hopefully with instructions. That is an additional $200.00.
Your friendly neighborhood SOT3 holder/dealer ("Class III" dealer) should have the necessary forms, or you can contact BATF directly and they will send you the necessary forms. Be sure to specify that you need one set for making an NFA weapon (your SIG) and another for purchasing/transferring (your silencer).
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