The full size Glock in .40 is the 22, I don't think they have a 22 with the ambi mag release on both sides, the 4th Generation models have a switchable magazine release for right or left handed users.
Is there a full size Model like the 17 but using the 40 S&W that has mag releases on both sides?
Also is the Model 17 MB which does have mag releases on both sides still in production?
At the present time, new 4th generation Models: 17, 19, 22, & 23 Glocks have a REVERSIBLE magazine release that can be swapped from one side of the pistol to the other.
As for the Glock Model 17MB? I don't think it's ever been for sale on, 'this side of the pond'. There seems to be a lot of confusion about this particular model designation, too. I know for a fact that, 'MB' designated a Glock pistol with a trigger lock.
Personally I remain unaware of any, 'MB' model that had an ambidextrous magazine release. Maybe, but, I've never seen one here.