The RGD-5 is a Soviet-made offensive fragmentation grenade that was made standard in 1954. It contains 110g of TNT, although it mostly relies on its explosion for damage due to its lack of splinters capable of reliably penetrating armor outside its kill-zone. Today, this grenade is one of the cheapest hand-held explosives in the market costing only 5 US dollars a piece, although it is low powered compared to modern grenades. Original RGD-5 grenades are still being produced in Russia, although clones are being made all-over the world.
In the Zone, the RDG-5 is the most common explosive device available and carried by most stalkers, it is also fairly cheap with one costing about 500-600 rubles per piece only. Although it has a low blast radius, the RGD is invaluable for room clearing and urban combat as due to its low powered nature, its explosion limits its destruction to a small area.
The RGD-5 is only slightly weaker than the F1 grenade - at point-blank range it can only deal 300 damage as opposed to the Efka's 360. The main difference is that the RGD-5 has a smaller blast radius than the F1.
Distantsionnaya literally means "Long Range". It refers to a "Defensive" type fragmentation grenade, which is used from cover to engage distant targets in the open. In contrast, Nastupatel'naya ("Offensive" or "Assault" type) concussion grenades are used by advancing troops to engage close-range targets that are dug in or are occupying strong-points like bunkers.