Not sure if the places where you have the geometry intersect are such a good idea. Especially if the normalmap does not show any sign of it.
Those areas will probably sometimes look quite strange when lit in the engine.
The raised section on the side of the receiver which has the safety switch on it looks funny because you seem to have left the shadows and highlights from the original photo. It might even have been better to model that in to the low poly version so that when viewing the gun from 1st person view you can't see the forward edge.. because that just looks wrong. Or use paralax mapping, but I'm unfamiliar with it and dunno if it has that much capability.
On further inspection you have a lot of funny shading, like the top of the gun being highlighted while the top of other sections are dark.
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Those areas will probably sometimes look quite strange when lit in the engine.
Otherwise it looks good however.
welcome aboard
On further inspection you have a lot of funny shading, like the top of the gun being highlighted while the top of other sections are dark.