Originally Posted by
Geezer
Although we use the T numbers are shorthand for different triggers, T actually stands for a type, mark, or variant of a gun. So the 75T01 match rifle is a variant of the 75; it does not use the trigger known as T01. The 50T01 is a 50/45 cross; it does not use the trigger known as T01.
There are T03 and T04 variants of the 24 series.
The T05 and T06 variants do involve a different trigger, but also some other changes to the internals.
It’s a bit like military nomenclature - M16 replaced by M16A1, replaced by M16A2, then M16A4.