OOB 35 Finland – some weapon confusion

[TDR]

I was having a quick look at the Finnish OOB before looking at making a scenario.
I noted 2 oddities that tend to be somewhat confusing:

In the Units table there is the following:
Unit no: #44
Name: 75mm M40 AT-Gun
Dates: 6/43 – 12/43

If this is the Finnish purchased German 7.5 cm Pak 40, should not the dates be 6/43 – 12/46.
Or have I mixed this with some other AT gun?

In the Weapons table and with various units there is this:
Weapon no: #93
Weapons name: M30 Rifle Gren
Looking at the various units with this weapon it has a date range of 1/37 – 12/46.

I am unsure what this rifle grenade is.
Is it the Dyakonov's grenade launcher that entered service with the Soviet Army about 1920 – 1930, or something else?

I can not find anything on the M30 Rifle Grenade to clarify what it is exactly.
Simply what is it?