Information about the acquisition of K4 automatic grenade launchers for the Polish armed forces caused quite a few controversy. On the 1 hand, due to the scale and cost of respective 100 million dollars (the exact price is not yet known), and on the other, due to the deficiency of technology transfer or acquisition of grenade launchers in Poland. Here we are talking about 500,000 pieces of ammunition and respective 100 copies of a 40 mm caliber device grenade launcher. presently in the armed forces we have about 200 Mk19 Mod 3 grenade launchers of American production and an unspecified number of German HK GMG utilized in peculiar Troops.