1PN51-2 (Russian: 1ПН51-2) is the GRAU index for a Soviet designed passive night scope for the RPG-29 rocket launcher. 1PN is the GRAU index of night vision devices, where PN stands for Nochnoy Pritsel (Russian: Ночной прицел) meaning night sight.
The scope weighs 2.1 kg and measures 280 mm × 192 mm × 106 mm (length × height × width). It is thus more compact than the similar multi-model 1PN51 night vision scope.
It is attached onto a matching side rail on the RPG after which a lever on the scope is pressed to hold it in place.
It comes in a metal container with room for extra batteries, battery charger and the other accessories, weighing 6.45 kg in total.