Check out 4 awesome SUBD-based 3D packs from Mihai Muscan that can help you create hard-surface models.
Mihai Muscan's packs are VFX-production friendly and have quad-based topology. The models look great in close-up shots and high-resolution renders. If needed, they can be modified to suit your purposes.
The assets can help you enhance and diversify your environments, machinery or weapons. All assets go in FBX and 3ds Max formats. The number of assets varies from 10 to 22, textures are not included. You can use them for commercial and non-commercial projects.
You have 13 designs to choose from, so get creative!