You want an A-35 MGL in TLAD or TBoGT? Here is the link.

http://www.gta4-mods.com/weapons/a-35-mgl-grenade-launcher-f9784

With combining the provided WeaponInfo from this mod and my WeaponInfo mod,
100% Guaranteed, this weapon will puck out the grenades at extended range
and 6 rounds loaded! Genetically, different, baby!