Dont know exactly what Benelli uses but these are the common abreviations for chokes. (*asterisk are used also*)

Cylinder " C"

Skeet 1 " SK"

Improved Cylinder " IC"

Light Modified " LM"

Modified " M"

Improved Modified " IM"

Light Full " LF"

Full " F"

Extra Full " XF"

Some chokes have retrictions marked in 1/1000ths of an inch, such as .030" which would be a " modified" choke.



hope this helps, doubleA