IGN has released a tutorial on how to lower weapon in halo 4. heres the link.
The combo is now Jump, crouch, reload, and then hold down on D-pad. for a few seconds. It still requires you to be in offline mode.
EDIT: I guess I’ll give the exact buttons needed for each control scheme as well.
Default: X,A,B, D-pad down.
Southpaw: X,A,B, D-pad down.
Recon: A, [Right bumper], (left stick), D-pad down.
Bumper Jumper: B, [left bumper], (left stick), D-pad down.
Boxer: X,A, (left stick), D-pad down.
Green thumb: X,A,B, D-pad down.
Fishstick: X,A,B, D-pad down

