The barrel of the US-manufactured gun had exploded when India-made ammunition was being fired from it on September 2.
A preliminary inquiry has found that the explosion took place due to faulty ammunition supplied by the Ordnance Factory Board (OFB) and a further probe into the matter was on, the sources said.
Asked about the findings of the probe, OFB spokesperson Uddipan Mukherjee said, "Any such failure is attributable to a complex phenomena pertaining to internal ballistics as the shell moves at a very high speed inside the barrel."
Without specifically commenting on the findings of the probe, Mukherjee said ammunition used in the M-777 gun had undergone the required quality tests.
India had received two M-777 ultra-light howitzers in May, each worth around Rs 35 crore, after a gap of 30 years since the Bofors scandal broke out, and the accident took place in one of them.
The field trials of the 155 mm, 39-calibre guns, manufactured by BAE Systems, were being carried out at Pokhran in Rajasthan with an aim to collating various critical data like trajectory, speed and frequency.
The Army had received the howitzers as part of an order for 145 guns. Three more guns are to be supplied to the Army in September 2018 for training purposes.
Thereafter, induction will commence from March 2019 onwards with five guns per month till the complete consignment is received by mid-2021.
India had last procured howitzers in the mid-1980s from Swedish defence major Bofors. The alleged pay-offs in the deal and its subsequent political ramifications had severely crippled the Indian Army's procurement of artillery guns.
The defence ministry had struck a government-to- government deal with the US last November for supply of the 145 howitzers at a cost of nearly Rs 5,000 crore.
The Army has been pressing the government to speed up its modernisation programme.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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