Hello, William -
According to the instruction manual for the Gamo C-15 Blowback firearm, you could use ". . . a 4.5mm caliber cleaning rod (.177 in) if a BB has become blocked in the barrel."
The information regarding a blocked barrel is on Page 11 of the instruction manual in the REPAIRS section.
If you do not have the instruction manual, this is the link to the PDF document (Adobe Reader software needed - free):
TinyURL link:
https://tinyurl.com/y9zwcvtkThe information is on Image 6, right side, of the PDF document.
(Quote from the instruction manual):
Repairs
A compressed air p1st0l (have to spell it that way or the Fixya algorithm reads it as a "bad word") that is not functioning well can be dangerous. Do not attempt to repair the gun yourself, since this may cause abnormalities in its functioning. Use a 4.5mm caliber cleaning rod (.177 in) if a BB has become blocked in the barrel. Take your gun to approved gunsmiths or to professional repair specialists approved for this type of product.
(End quote)
Best wishes.
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