As Galland said, it was made by the Rifle Factory Ishapore (RFI), but they had another way to reduce the cost of buying from abroad. When in the 1960s India decided to replace the venerable bolt action that had served it through the two world wars with a copy (without license) of FN's FAL in 7.62mm, they couldn't produce them fast enough so they decided to issue them only to front line troops. They kept using RFI's existing tooling for Lee-Enfields to build a 7.62mm NATO version to replace the .303s in rear elechons and reserve forces. The 2A and 2A1 are the result.
It is an adaptation of the pre-WWI Lee Enfield Number1 MarkIII design. They had to use improved metal because of the higher chamber pressures developed by the new calibre so don't worry about using 7.62mm in a 2A, 2A1, (or a converted No4, the No4 design from the 1930s was made with improved metal compared to the earlier No1MkIII) as long as it is in serviceable condition. The Indians designated the first 7.62mm version of the No1. MkIII as the 2A. Later they recalibrated the range adjustments on the rear sight to match the 7.62mm ballistics (the 2A's sight was as for .303British) and called this version the 2A1. The smaller 7.62mm cartridge allowed a larger magazine capacity, twelve rounds instead of ten, and the magazine has a more sqare shape than on .303 rifles.
The barrel on the example kytimberman's buddy has has been modified or may be a replacement. The knox form doesn't look original to me and just forward of that is where the rear sight would have been mounted on an original, which was also longer and didn't come with a flash suppressors. Synthetic sporter stocks like this one are made by Ram-Line and by ATI and are commonly available.
The finish on RFI production is generally held to be poorer than on other Lee-Enfields, but functionally they are quite accurate for a military service rifle of their time and they are robust and reliable.