Your rifle, you need to work on the smaller details. Lots of places where you would expect to see hard edges and not seeing them. Off the top of my head the from of the silencer (I assume that's a silencer but not sure), outer edge of the front of the scope, etc...
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Low Poly Shild by veluxdesign on Sketchfab
This is i made from my head just a practice day made in 1h no reference just straight a head still a beginner