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"R91 Assault Rifle" from Fallout New Vegas (R91 didn't appeared in game, but I found rifle models in internal game files)

Replaces m4 
How to install: Replace the dff and txd files in \GTA San Andreas\models\gta3.img  

Mod features:
Detailed model 
Detailed textures

All functional

Credits: 
R91: Fallout New Vegas
Conversion and edits: Xenotime
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