This is a dimensionally accurate, photorealistic model of a 5.56x45mm NATO cartridge with an M193 bullet that includes both an unfired cartridge and the components after firing. The detail in the model extends only to surfaces that can be seen externally after manufacturing or after firing, though the unfired projectile and unloaded cartridge (with primer installed) can be used as standalone assets, too.

The fired components include both the spent casing with a struck primer and the projectile with rifling marks for visualizing the bullet in flight. Each cartridge includes 3 separate components: copper-jacketed bullet, brass casing, and primer. At higher subdivision levels, these models can be used for photorealistic renders in even very tight shots.

Originally modeled and textured in Blender 4.3. Materials have been baked into PBR image textures for portability with different software packages.

Model:

--100% quads

--Real-world scale (from engineering specs)

--2 variants (fired and unfired)

--3 separate objects per variant (casing, primer, bullet)

--Unwrapped UVs

--Subdivisions modifiable in Blender file

--3 formats (Blender, FBX, OBJ)

Textures:

--PBR workflow

--4K PNG textures for casing, 2K for bullet and primer

Note about subdivisions:

Listed polygon and vertex count is for the unfired base geometry in Blender. It is recommended to use at least 2 subdivision levels (28,827 vertices / 28,800 faces) for visual fidelity and dimensional accuracy. You will get a noticeable improvement in tight shots for going up to 4 subdivisions (460,899 vertices / 460,800 faces), but any higher than that and the visual quality will be limited by the textures. FBX and OBJ exports have been made with 3 subdivisions.

Note about OBJ and FBX files:

Some softwares may import materials with sRGB encodings for all the textures. Only the diffuse map should be applied with sRGB color space. You may need to manually change the encoding to non-color (Blender) or its equivalent to get photorealistic results when using the FBX or OBJ files.