Slight confusion here.
Let me clear this up.
VKB makes bases and grips.
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The Gunfighter base, when sold with the extension, stronger springs and the small base plate (needed for center mount of the stick), was called "Gunfighter Pro". The exact same base, when sold without those accessories, was called "Gunfighter".
As an added complication, after the Gunfighter was already in production, they reversed the connector between the base and the grip. First iteration used the 3-pin connector (now called "3-pin Revision A") with the 3 pins on the base and the 3 contacts in the grip. Current iterations are using the so-called "3-pin Revision B" connector, with the 3 pins in the grip and the 3 contacts in the base. The second iteration is also known (mostly in US) as "Gunfighter Mk. II" (or "Gunfighter Pro Mk. II" if sold with extensions).
At least in the EU shop they will no longer sell the Gunfighter Pro, but instead offer the extension accessories as a separate purchase (good decision).
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Now about the MCG grips.
They have a MCG and a MCG Pro grip. The Pro grip has more features (such as a 4-way hat + push for the thumb, instead of just a button).
They also had a third, special MCG version, to be used on a Warthog base.
And they are supposed to make 5-pin versions, for older bases. But this is not of interest, if buying a new base+grip (which are 3-pin Rev.B - both the base and the grip).