Under-Barrel Grenade Launcher (UBGL) An Ace Under Your Barrel The 40mm UBGL is a real game changer in combat actions and counter-terrorist operations for Infantry, Special Forces and Law Enforcement Units. The 40mm GP-34 Under-Barrel Grenade Launcher is compatible with various Kalashnikov Assault Rifles. The weapon augments firepower drastically due to a variety of grenade types. The UBGL allows operator to be more versatile and adapt to the missions. It also gives ...