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The gun caliber is a function of ammunition diameter. 155mm 45 caliber is bigger gun than 130mm 52 caliber. That is the maximum the existing gun carriage can carry.

From what I understand, DRDO is currently making an electromagnetic gun which is a rail gun and coil gun hybrid as, from whatever little information is available, the gun has both bitter coil based transmission line and rails.

No orders placed.

Saurav Jha's Blog : Interview with the Chief of DRDO, Avinash Chander -Part II

New tender is coming out with OFB, Punj Lloyd, Bharat Forge and Tata Power SED as participants for upgrade.

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There was news regarding this a couple of days back in a leading hindi daily. I thought it must be old recycled news. The barrels are supposed to be made at the Kanpur factory and final assembly at gun carriage factory Jabalpur.

Fully indigenous my arse. It's Elbits ATHOS system being peddled as indigenous.

No guns were upgraded by OFB. 180 guns were upgraded by Soltam. It is not a proper auto loader but a semi auto pneumatic loader assist device. About 300 M-46 guns would be upgraded now, private companies and OFB will compete for the contract. The older Soltam upgrade was not very successful...

BM-21 Grad on Tata 6x6 (rejected)

Common sense says that all the private players who are prancing around showing off their imported wares be given a production run of the 45 caliber Dhanush gun. ie L&T Tata Kalyani/Bharat Forge Mahindra and also BHEL. Let them absorb the technology and train the manpower before the 52 caliber...

Internal trials, these seem to be user trials.

About a 100 or so FH-77 were scavenged in the late 90s for spares, then in early 2000s spares deals were made with BAE which salvaged the situation. OFB has been making significant number of spares for FH-77 for quite some time, They proposed a 45 caliber variant of FH-77 way back in 2005-6...

1. Around 180 guns were upgraded to 45 caliber, but they didn't manage to reach the advertised ranges. There was also a problem with barrel burst with Soltam supplied kits. OFB proposed Metamorphosis upgrade didn't happen. 2. The difference could be due to different shell types.

Artillery procurement summed up (report from march 2013)

DRDO 155mm/52cal ATAGS specs. They are not aiming very high, it seems.

Launcher will have to be upgraded with additional networking features and data link for midcourse guidance.

http://www.indiastrategic.in/topstories3042_DRDO_strives_self_sufficient_armament_designer.htm

IMI's TCS could already handle both 160mm and 227mm rockets, so wouldn't have required upscaling but rather recalibration.

Its hard to tell whether its a vane type control like on IMI's TCS or disc type airbrake control on French SPADICO. Since IMI was supposed to be the partner on Pinaka, its most likely to be vane type control as seen on IMI rockets. This is IMI's proposal for fitting TCS on Pinaka from...