WR-40 Langusta is a Polish

Poland

Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

 self-propelled

Self-propelled

Self-propelled often refers to some form of self-propelled travel. It can refer to* Self-propelled anti-aircraft weapon* Self-propelled anti-tank gun* Self-propelled artillery* Self-propelled barge T-36* Self-propelled gun* Self-propelled mortar...

 multiple rocket launcher

Multiple rocket launcher

A multiple rocket launcher is a type of unguided rocket artillery system. Like other rocket artillery, multiple rocket launchers are less accurate and have a much lower rate of fire than batteries of traditional artillery guns...

 developed by Centrum Produkcji Wojskowej HSW S.A.

Huta Stalowa Wola

Huta Stalowa Wola is a steel mill and manufacturing company in Stalowa Wola, Poland.It was established in 1938-1939 in Second Polish Republic. It was a major part of a series of investments made by the Polish government in the years 1936–1939 to create the Central Industrial Region...

. The first 32 units of the WR-40 will enter service in 2010.
The Langusta is based on a deeply modernized Soviet BM-21

BM-21

The BM-21 launch vehicle , a Soviet truck-mounted 122 mm multiple rocket launcher, and a M-21OF rocket were developed in the early 1960s. BM stands for boyevaya mashina, ‘combat vehicle’, and the nickname means ‘hail’. The complete system with the BM-21 launch vehicle and the M-21OF rocket...

 launcher. The carrier used is a 6x6 Jelcz truck model P662D.35 with armoured crew-cabin.
Another step in the modernization of Polish rocket artillery is project 'Homar', corresponding to MLRS

M270 Multiple Launch Rocket System

The M270 Multiple Launch Rocket System is an armored, self-propelled, multiple rocket launcher; a type of rocket artillery.Since the first M270s were delivered to the U.S. Army in 1983, the MLRS has been adopted by several NATO countries. Some 1,300 M270 systems have been manufactured in the...

 rocket system, carried on from 2007.