Beretta chokes question?

[Thad]

Does anyone know what OBS, OBF, and MCF stands for? I am looking on Beretta`s site and it has these next to the chokes. I think the O is for Optima chokes. It is not as simple as mod. full, cylinder because it has these and then the above mentioned letters.

 

[JDL]

OBS - Optima Bore Sporting (extended chokes)
OBF - Optima Bore Flush
MCF - Mobile Choke Flush

 

[Thad]

Hey thanks, I just found EOC also extended optima chokes. How about VEM?(Aha!) Victory Extended Mobile

 

[Thad]

Ok just when I thought I had it all figured out. OBSP,OBSK,OBTR,OCF holy crap. They also have a designation on some of the shotguns that says Lylium?