So there is a way to lower your weapon in Halo 5, but there’s an issue with it. You do the same method as in Halo 4 which is A, B, X, and down on the D-PAD. When you do it your gun won’t show on your screen and your crosshair will only show like it normally does. But your gun is still not lowered. This is a big issue for anyone who wants to do a Halo 5 Machinima. Just letting you guys know about this issue.