Download Links:

IV: https://www.gtainside.de/en/gta4/weapons/126557-hd-iv-weapons/
TBoGT: https://www.gtainside.com/en/gta4/weapons/129297-tbogt-hd-weapons/
TLAD: https://www.gtainside.com/en/gta4/weapons/143971-tlad-hd-weapons/

Great Weapon packs with better models, textures and even sounds. They use IV styled weapon icons, they have proper cutscene/prop models and they look similar to vanilla weapons too.
Not compatible with Animated Weapons, but the author seems to work on compatibility, so this might change in the future.