Not bad for a first attempt. A couple things jump out though. There seem to be a lot of hard edges on the low poly that are not affected by the normal map. Nothing in real life is a perfect sharp corner, so maybe bevel those edges on your low poly, or rebake the normal map to fix it.
Also, in the area towards the bottom of the handle, it looks like your low poly's profile did not match the profile of your high poly, as you can see where the normal map lays on the geometry. I would sacrifice a few more tris to smooth out that area and get the profiles to line up a bit better.
For an Uzi Defender knife the blade seems too wide and the grips too thin.
The gripping teeth you have as triangles, but because of the sharp angles between the smoothing the normals will not bake correctly onto them.
On your high poly loosen the edge tightness as well this will help convey smoothness onto the low polygon via normal mapping. You can see on the pommel of the knife appears to be a very slight bevel, but it's way too small. We want to maginify this curvature to fully use the normal mapping.
I have also modeled and baked this same type of knife, so if you would like to see how I did it, just ask, and I can send you the files.
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Also, in the area towards the bottom of the handle, it looks like your low poly's profile did not match the profile of your high poly, as you can see where the normal map lays on the geometry. I would sacrifice a few more tris to smooth out that area and get the profiles to line up a bit better.
Keep up the good work!
The gripping teeth you have as triangles, but because of the sharp angles between the smoothing the normals will not bake correctly onto them.
On your high poly loosen the edge tightness as well this will help convey smoothness onto the low polygon via normal mapping. You can see on the pommel of the knife appears to be a very slight bevel, but it's way too small. We want to maginify this curvature to fully use the normal mapping.
I have also modeled and baked this same type of knife, so if you would like to see how I did it, just ask, and I can send you the files.