Respect mod author work and if you upload anywhere or re-upload anywhere then always give credits in this format: Original Model by Rockstar Games Edited, Rigged and Converted by Vampire Re-upload/re-edited by <your name>
File credits
Rockstar Games for Assault SMG model. Converted to Grand Theft Auto IV by Vampire
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Something interesting which everyone likes because of Futuristic Style? Yep it's Magpul PDR.
Can be replaced with any weapon (most preferably FN-P90 from The Ballad of Gay Tony.) or add as new weapon in game by getting P90 animations from TBOGT and install it to base game as addon.