The white bb residue inside the barrel got me thinking.
Maybe it's "rub off" of bio-degradeable bbs.
That's always a chance, however IDK if you have ever ran bios through your gun.
I mean, it's the only plausible answer I can think of.
There's no way your gun "melted" bbs inside your barrel.
Laws of physics and toy guns say no-go :lol:
I'm glad you found a barrell though.
And for those of you who don't want to have a custom barrel cut and grinded, I'de look into getting a barrel slightly shorter then stock that are commonly and easily accesible.
You'll loose some range over a custom one, but it'll still be an upgrade over stock in both groupings and FPS.
-Brian