The official Indian military name appears to be TELESCOPIC SIGHTING 5.56MM RIFLE. It is commenly called the OFB (Ordnance Factory Board) 2.5x on the internet. It appears to be built by the Ordance Factory Dehradun (OFD). It appears to be closely related to the similar looking OFB 4x scope.

Images



On INSAS rifles.




On Excalibur MK-1 and 1B1 rifles.




On Indian SIG-716 rifles.




Scope specifications from Ordance Factory Dehradun (OFD).




OFD add using the name TELESCOPIC SIGHTING 5.56MM (INSAS) RIFLE.




OFB add showing the INSAS and accesories including 2.5x scope.




OFB add showing the INSAS with 2.5x scope mounted.



References



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