OK.....let us look at artillery derivations....now I will grant you the 105mm was the most prolific artillery in WWII but,,,,,,
If you have the M2 105mm the same kit with very minor changes makes the M2A1. If the sprues were done right a couple of part changes makes the M101A1 (similar to what Trumpeter did with the M198 kits)
Now....A small add on sprue and presto, you have the 3 inch gun...a whole brand new kit...never produced before.
Now....make a whole new kit of the M1A1 75mm.....now with a new barrel and a few additions....you have the 4.2 inch howatar used in Vietnam
OK....make a sprue of the M3 carriage and add the sprue from the M1A1.....you have the M3 75mm howitzer.....now change the barrel and use the 105mm set....you have the M3 Mountain howitzer.
7 different kits with a little more work........the M2A1 is the latest every manufacture has one.....lets see if AFV makes as good a use of it as Dragon has!!
Rounds Complete!!