gbb fill valve type A vs type B?
 

Hello there gents,

I have a broken fill valve that need replacing. Easy fix, however when searching for the replacement part I found there are two types? I am having trouble finding any real information on the differences. All I am able to find is the head diameter is different. By less than 1mm. Is the threading the same? The description for both say they fit "most" gbb mags.

The mag in question is for a we 4.3 hicapa. Any help is appreciated.
Thanks

There's more than 2 types. And yes the threading can be different, as well as the diameter.

For WE just buy WE replacement ones.