Your model and bake are awesome, however the textures need some work. There's no definition between the different types of polymers and metals and it's actually kind of challenging to find where one material ends and another begins. Let's say for hypothetical reasons this:
was your reference. Notice how the magazine does not have as high a specular value as yours, and how the plastic is tinted a very dark orange that can be read pretty well. Also, the polymer on the main receiver is again, not as specular as your own model. I think your metal is fine but I would recommend giving it a different bump map from the plastic to make it easier for whoever's looking at this to know that the metal is metal and not plastic. Hope this helps!
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was your reference. Notice how the magazine does not have as high a specular value as yours, and how the plastic is tinted a very dark orange that can be read pretty well. Also, the polymer on the main receiver is again, not as specular as your own model. I think your metal is fine but I would recommend giving it a different bump map from the plastic to make it easier for whoever's looking at this to know that the metal is metal and not plastic. Hope this helps!