20" On a BA XR8

Hey Guys,
First timer poster, long time ford man
I was just wondering if anyone know if 20" mags will fit my baby? and will i need to get the guards rolled?
thanks in advance.
KEGSTA
First timer poster, long time ford man

I was just wondering if anyone know if 20" mags will fit my baby? and will i need to get the guards rolled?
thanks in advance.
KEGSTA