Well, what I'm really wonderin is what a 12 inch rmg-212 is ? As the 12 inch would be called a 309 but even so they were both designed with SPU compliance in mind.
Yes and if you look at the data it says "12 inch over all" (that is with the counter weight) Lateral lenght= 9 1/8 inch. It's all in the name.. 212 is for 212mm or 9 1/8 th inch and 309 is for 309mm or 12 inch.
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