Wasn't Soltam upgrade deal cancelled on grounds of corruption ? We did receive some of them though, rest of the M46 was upgraded by OFB.
Soltam did complete the upgrade of first lot of 180 guns, and it was during the follow on order that things fell down. So around 200 guns are there.
OFB Kanpur will start delivering Metamorphosis/Sharang upgrade from this year for 300 guns. OFB upgrade is actually better than Soltam one. Soltam guns have 36 km range, OFB ones have 38.5km. And they come with a warranty of 600 rounds of fire for its barrel. So that's good.