[QUOTE=beanz2;23433352]The Sig 716 Patrol that I have also has a lot of proprietary upper parts that makes swapping AR10 parts impossible. To me the value is only the registered AW lower.[/QUOTE]

Thanks. Good to know.

[QUOTE=AregularGuy;23432719]DD has a proprietary ambition mag release. They will not sell you one if the rifle has a bullet button on it. I had to have someone in another state send one to me so I could replace it. Also the upper uses a ball detent on the charging handle and no cut out on the upper...