You might want to check a video by Ferrari Steve on the SIG AEP package before you send it in.
http://www.youtube.com/watch?v=hkDfByRBtYs&t=552s
You might also want to check out Robert Burke ("The SIG Armorer):
http://www.thesigarmorer.com/
http://www.youtube.com/watch?v=hkDfByRBtYs&t=552s
You might also want to check out Robert Burke ("The SIG Armorer):
http://www.thesigarmorer.com/