Hello
I had a look at the barrel and the file size seems a bit big (310KB)
I would have expected it to be more like 50KB, I also had a look at the barrels given with FPSCR and the biggest one is 41KB.
From this maybe something went wrong with the export, try exporting it to .obj then importing to blender and exporting again to .x
How many polys does the barrel have, I would expect it to be very low.
and if you want anyone to have a look at it properly then it would be best in .obj format as then we can import it to our software.
I've got something to say
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It's better to burn out than fade away.