The Kasirga is roughly similar tot the Smerch MLRS from Russia. The Kasirga has only longer range, and fewer rockets. Therefore, the Kasirga needs upgraded. 4 Rockets is not much if they are unguided... ;-)
B611 "Yildirim" SRBM is a really other system than the Kasirga. The Yildirim is a guided missile with a range of 150km and can be equipped with 450kg HE. It's like the SCUD missiles early variants with guidance systems.
This missile should also be upgraded with more missiles on a truck or tracked vehicle. The range is good enough for the battle field range today. The longer version, possibly 300km or maybe 500km will also produced after a couple yaers I hope, but I really really hope with cruise missile technology...