I have Refined this Rifle MA41 in Blender and Unwrapped it by zen UV Plugin without any kind of issues like stretching or overlapping.Texturing has been done in substance painter at 2k.At last, I render it in marmoset toolbag 4.
OBJ (OBJ, filesize: 3.77 MB), FBX (Autodesk FBX, filesize: 3.01 MB), TEXTURES (Textures, filesize: 120 MB)