VoxelWeapons community on reddit.
Itch.io - Buy voxels & sprites. Also mods for Doom 2!
CGTrader - Buy voxel guns, with sprites.
Cubebrush - Buy voxel guns, with sprites.
Sketchfab - Buy FBX only models at slightly less cost, no sprites or extras.
Unity Asset Store - Buy big asset packs.
DeviantArt - Voxel weapon gallery and lore descriptions.
Same as above but on Newgrounds.
Same, but ArtStation.
Same, but CGSociety.
Same, but Pixiv.
Slow-motion videos of voxel guns.
Just fast GIFs of voxel guns, no descriptions.