sentences:  The Y3 was launched during the 2003 United Kingdom Defence Systems & Equipment (DSEi) International Exhibition.The launcher fires 40x53mm high velocity, medium trajectory calibre grenades at a rate of 360 to 425 rounds per minute.Operating via the long-recoil principle, the Y3 fires from an open breech (minimising the opportunity for grenade cook-off within the magazine) when in counter-recoil.