Hey guys here is a cool glitch,
It provides you with a riot shield in front of you while shooting a mounted machine gun (a.k.a turret).

What you will need:

Class A:
Perk 1 must be One Man Army
Everything else does not matter

Class B:
Primary Weapon must be Riot Shield
Perk 1 must be One Man Army

Step 1: Go to a mounted machine gun.

Step 2: Go close enough to where it says press X to use!

Step 3: Press Y to switch to One Man Army, slightly after pressing Y, press X to use the mounted machine gun. (You must do this before the One Man Army screen comes up)

Step 4: If done correctly (this takes lots of practice, once you got it down however it is a piece of cake) you should be on the mounted machine gun with the One Man Army screen up.

Step 5: Select Class B or the one with the Riot Shield.

For your information: Tt does not look like you have a Riot Shield on but you do!

Thanks and hope I helped! This is great for completing the mounted machine gun challenge!

Sincerely,
xSiNx ExTr3Me x

Video Proof:



I do not take credit for this glitch! Just reposting for the TTG community!