I'd continue sculpting. Right now, the medium forms of the sculpt are blobby. There's few places where the sihlouette is different and sharp, as oppsoed to round and soft
Sculpting anatomy is best represented with sharp angles, or else it quickly turns into a smooth ball. Once the features are locked in, it's time to smooth and blend together.
that´s the high poly??? mmmmm.... you should work more on its edges. They are way too sharp and because of this the weapon will not interact well with the light.