cleaning a very dirty barrel

[WebleyWombler]

Sounds like it might be congealed grease from storage? Try blocking up one end and filling with a solvent ( Thinners, Nail Varnish remover, paraffin etc) overnight and see if that makes a difference.

[isobar]

Sounds like it might be congealed grease from storage? Try blocking up one end and filling with a solvent ( Thinners, Nail Varnish remover, paraffin etc) overnight and see if that makes a difference.

makes sense,it does look like black gunge looking through the barrel and grease would attract dirt,i haven't tried any solvent to shift it,cheers for that.

[LeeO]

A Cillet brush,
Bang and the dirt is gone,

sorry,

[leetrenchard]

I wouldn't use fibreglass, it's very abrasive at its ends, I use a brass brazing rod or those long wood kebab sticks.

I only use these as a last resort but you can get bronze brushes for barrels. Just had to use one to scrub out the crown end of a bsa barrel that had a rough rusty patch in it. This took the gun (Scorpion pistol) from very inaccurate to accurate.