Shadow 2 barrel rough marks

[ilicmarko]

As it's Nationals season I am preparing my 4-year-old Shadow 2 for competition, for reference I think the gun ate around 15k rounds.

While doing a closer inspection I noticed that half of the barrel inside the barrel rifling grooves, there are some rough marks, like carbon. Hopefully, I captured it with my phone as I don't have a bore scope.

 

 

When I look at the chamber the grooves are clean.

 

 

I tried hitting it with a plastic pick, but nothing. I got the soft metal one and when I tried it I could see metal shavings

 

 

Can someone advise what is this?

 

I shoot factory FMJ ammo except in a few cases (recently) when I shot hand loads with cast bullets. Also, I clean my gun after every season.

 

Thanks in advance.

[jpm2953]

Looks like some light leading. Get some chore boy scrubbing pads from the hardware store/grocery store and it will come right out. 

[ColoradoNick]

Leading for sure. A new brush, “lead out” or “chore boy” will all work. I stopped using coated bullets because I got sick of cleaning that