Don't we have license to produce them ?
I know they are derived from them But I thought they have modified with some tweaks and now it's OFB legit property or licensed produced.
800 RPM is pretty good . What abt AK 630 do we have license to produce them ?
Nope...as a rule of thumb if the number of deployed system is low then it's pretty much always imported.
We have license for 2A42 coz we're producing hundreds of BMP-2s. So we started making 2A42s as "30mm gun" and "CRN 91"
Similarly when we got licence to produce MiG-21s in large numbers we also got the same for its autocannon; GSh-23-2. So now we make that as "Ghasha Gun" (I know it's extremely cringeworthy, but OFB is OFB). This is the sole reason why we used GSh-23-2 on Tejas instead of anything else.
Other than that almost all auto-cannon are imported, including GSh-30s.
And as for rate of fire, 800 is good if you have speciality ammunition like air-burst or AHEAD or proximity fuzed...but if you simple HE or HE-I then you're RPM should be atleast more than 1200