The B refers to the button press mag release on the B variant.
They will fit no problem. A couple if the kits have gone up on the ee in the past, but if you want one, move fast because the kit has been discontinued. I thought about 1 but @ $600 US that is more than I paid for the gun new. Once you get used to it, the paddle release is very easy to use using the middle finger on your trigger hand or your thumb on your supporting hand.



























