For political reasons, India decided to adopt the 7.62mm NATO cartridge when it needed to replace its No1 MkIII SMLE bolt action rifles with a modern self-loader. They chose the FN FAL as the rifle to adopt, but wanted a license to produce it domestically at the Ishapore rifle factory. FN insisted on the Indians buying Belgian tools as part of the agreement, which India was unwilling to do. So instead, Ishapore used the samples it had of both British L1A1 and Belgian FAL rifles to produce its own reverse-engineered drawings.

The resulting plans use a mixture of British ("inch") and Belgian ("metric") parts, and are not interchangeable with either standard pattern. As a result, the Indian 1A1 rifle is a clone of the FAL that is not actually parts compatible with the FAL. That did not prevent Ishapore from producing hundreds of thousands of them, with production apparently ending only in 2012.

Thanks to Sellier & Bellot for giving me access to this 1A1 example to film for you!