Download Links:

-IV Pack: https://www.gtainside.com/en/gta4/weapons/126557-hd-iv-weapons/

-TBoGT Pack: https://www.gtainside.com/en/gta4/weapons/129297-tbogt-hd-weapons/

-TLAD Pack: https://www.gtainside.com/en/gta4/weapons/143971-tlad-hd-weapons/

-Higher Quality NOOSE headgear (optional): https://www.gtainside.com/en/gta4/skins/144666-hd-noose-headgear/

Great Weapon packs with better models, textures and even sounds. They use IV styled weapon icons and they look similar to vanilla weapons.