On Browning shotguns, the choke markings are usually found on the inside left of the barrel.
Heres how to interpret the markings:
* designates full choke (F).
*- designates improved modified choke (IM).
** designates modified choke (M).
**- designates improved cylinder choke (IC).
**$ designates skeet (SK).
*** designates cylinder bore (CYL).
I'm going to stand outside so if anybody asks, I'm outstanding!