Ammo pouch carry, if I'm on the right page, is when you rest your gunhand/wrist/forearm rests on your strongside ammo pouch, which is about 1:00-1:30, maybe 2:00 on your Load Bearing Equipment, aka suspendered belt.
Check out a Magpul Ambidextrous Sling Attachment Point, it lets your rifle hang horizontally in front of you like a 'flat ready'.
When you're moving out, it's ok to move your gunhand to the buffer tube area.