"The INSAS project exhibited many of the problems that afflicted the larger Indian defense research and development efforts," says Professor Rajesh Rajgopalan of the Jawaharlal Nehru University. According to him, "The INSAS project was established during a period of particular optimism in India's domestic defense industrial research, what one author characterised as a 'return to selfsufficiency' after two decades of depending on imported arms."
(...)
The 2001 CAG Report also points to a number of quality control issues with the INSAS assault rifle, the most serious of which was operability problems in sub-zero weather, a necessary requirement for an Army that is constantly deployed in the Siachen glacier.
(...)
Another CAG Report in 2005 noted continuing problems with the production quality of the INSAS rifle. Under new rules established by the Controllerate of Quality Assurance — Small Arms (CQA-SA) at Ishapore — new rules established because of quality problems with previously supplied INSAS rifles —INSAS rifles that failed three 're-proofs' would be sentenced as 'Drill Purpose' (DP) weapons, to be issued only to training schools for instructional purposes. CAG noticed that between April 2002 and June 2004, 3,666 INSAS rifles failed in the third re-proof, forcing them to be condemned as DP weapons.
(...)
Some variants of the INSAS family, in particular the Carbine, appear to be dogged by problems. The INSAS Carbine has undergone significant difficulties from the beginning.
(..)
even after the INSAS was produced and entered Indian Army inventories, quality problems with the gun and the ammunition as well as inadequate supply of the INSAS by OFB