Mark II FVT: 1/2 Muzzle changed color to orange-brown

Hi All,

I'm new to this forum, so a few words about myself:
I'm Patrick, 28 years old, from Germany, and enjoy sports shooting for 3 years now. (In Germany you can only buy most of the fire arms at the minimum age of 25.)

The last rifle I bought in December 2016 was a .22 lr Mark II FVT.
I clean my rifles after every shooting with oil and a bore-snake.
Last week suddenly half of the muzzle changed it's color to orange-brown after shooting.
I tried to clean it away with oil, but did not work.
I tried out around 10 shots CCI MiniMag and CCI Velocitor, both are copper plated.

Do you think that this could be copper? Changed color since too much heat from the HV ammunition?
What do you think, please? Did you share my experience in the past?

Thanks & Regards
Patrick

Pictures:
https://photos.google.com/u/1/share/...dNcHB6bVB2ZWl3
https://www.pic-upload.de/view-34245...70334.jpg.htmlhttps://www2.pic-upload.de/thumb/342...106_170334.jpg https://www2.pic-upload.de/thumb/342...106_170341.jpg https://www2.pic-upload.de/thumb/342...106_170354.jpg
https://photos.app.goo.gl/C9WSq0SnHx3t9Snx1

I bet if you hit it with some copper solvent and a rag it will come right off. My guess is that's where some solvent pooled when you pulled your bore snake through and that liquid evaporated off leaving the copper residue deposit.

As for the HV ammo causing too much heat in your barrel, that isn't going to happen. HV 22LR ammo is only running around 1600fps tops IIRC, and this is the same barrel steel Savage uses for all their centerfire rifles that often seeing bullet velocities of double that on every shot. Some even clock up into the 3900-4000fps range (32gr .204 Ruger ammo for example).

Thanks, I have some Milfoam Forrest at home so I will give it a try and sprayed it on the crown to let in operate over-night....
I will report the result....
Have a nice weekend!
Patrick

If you let it sit overnight you'll probably come back to the same thing because it will have evaporated off leaving the copper behind. Let it soak 5-10 minutes then just wipe it off - that's all the longer a good copper solvent needs to work. Any longer and you risk the evaporation issue.

The Milfoam Forrest foam seems to be to weak for this:

I tried it short (5 minutes) and long (3 hours) renewing the spray on foam 3 times. But no turning blue of the foam.

Then to test the foam I sprayed it on a copper projectile of a .223 cartridge. Here the foam turned blue but the copper bullet was just a little more shiny, so it removed / solved a few thin layers I assume.
I assume inside the bore the foam works well since it can not vapo

Some other solvent you could recommend please?

Thx.

Give it a rub with steel wool.

I don't think this is something to worry about.

I looked in my safe and noticed some orange around the muzzle of my 17hmr 93TR (I think that's the model). Looks different than your pictures because mine is concentric around the bore about 2mm wide and looks more like something made by the gasses coming out of the muzzle.

I have no signs of orange on my MK II 22lr. It has the same recessed crown as your rifle, but no sign of anything orange.

Might be some weird reaction with the rimfire powder/priming compound and the bluing. For sure it's nothing to worry about and most likely something to do with the bluing salts.

There is no way you can heat the end of a .22lr to have it change color

Light coat of CLP to protect...