If you want cheap but also don't want something that's totally obsolete use the RGD-5. If your nation is supposed to be a combination of Bulgaria and Serbia you should already manufacture them in your country. There's also the M75, which was the standard hand grenade for Yugolsavia. Serbia should still manufacture it as well and it would also be way better than the Mk. 2 and maybe better than the RGD-5 as well.
So please, look at what Serbia and Bulgaria already use because most of what they use fit your requirements for cheap and effective.



You think I didn't think that through? Jerusalem wouldn't be an immediate target first of all, but if it was, the Holy City has dozens of courtyards that would be used as hospitals, FOBs, and HQ's. Airburst or strafe those areas and that's support.