FX Impact M3 Airgun (Polygon mesh 3D model) is available on CGTrader for $39.99. Original author: mohammadsadeghip1369. Specs: 10000000 polys, 6240000 verts.
OBJ (OBJ, filesize: 105 MB), FBX (Autodesk FBX, filesize: 236 MB), TEXTURES (Textures, filesize: 151 MB), PNG (PNG, filesize: 151 MB), TBSCENE (Marmoset Toolbag, filesize: 257 MB), MAX (Autodesk 3ds Max, filesize: 327 MB)