Crosman Break barrel, bore rust and sight alignment issue

[$p00kygH0ST]

A friend of mine from work asked me to zero his crosman something NP .177 break barrel.

I started fooling around with it yesterday after getting home from my morning hunt.

First, the bore, I have pulled 60 patches, 10 ballistol then 5 dry, and repeated the process 4 times, still pulling what I'm assuming is rust out of the bore. It's getting much lighter, but I can't seem to get to the end of it. I've tried using a ballistol soaked bore mop several times, a nylon bore brush wrapped with a patch and soaked in AOA Cleaner/degreaser clp (the mop done before starting the patch pulling. Then again after running 30 patches and the brush) still comes out orange-brown. The bore looks shiny now, but still pulling rust. Any tips to get rid of it all? Or just keep repeating the process.

The nitro piston seems to be very consistent. Before I cleaned it I was getting an average of 682.4 fps with 10.65 baracuda match, after the process that jumped to 712.5fps average almost exactly 12fpe.

I have used several scopes and mounts, and regardless of the combo, at a 45mm height over bore at 15m I am maxing out the elevation, AT BEST Hitting 5MIL Low.
Is this just a barrel droop issue? All the tools I used show the mount is 90⁰/90⁰. Obligate Open sight rifle?

 

[Hateful McNasty]

I guess you could plug the muzzle and fill the barrel with vinegar over night then scrub out with fine oiled steel wool or brass brush then see if your patches come out cleaner . Maybe do this a couple of times .

 

[fishing43]

I guess you could plug the muzzle and fill the barrel with vinegar over night then scrub out with fine oiled steel wool or brass brush then see if your patches come out cleaner . Maybe do this a couple of times .

I may be wrong but I don’t think vinegar and metal get along very well. It may be corrosive

 

[.20calguy]

I had that issue with a Benjamin Prowler.
I cleaned it and shot copper clad pellets through it until I pulled rust free patches, then it shot and actually shot well!

A video of my results.

 

[rikkochet]

fishing43 is right, vinegar is a no no.
It will get rid of the rust, but it will also eat into the steel after the rust has gone, and you can't see what it's doing if it's in the barrel.
The only de-rusting chemical I use is Evaporust, it removes iron oxide but does not etch steel.
I recently de-rusted a BSA Cadet barrel with it. I plugged the barrel, filled it it with Evaporust, left it standing upright for twelve hours, then drained it out and checked the bore. Because it did not take much to fill the bore the process had to be repeated five times.
It will remove blueing, as a friend discovered when he used it to remove light rust from a Webley pistol by putting it into a tray and covering it.

 

[Hateful McNasty]

I may be wrong but I don’t think vinegar and metal get along very well. It may be corrosive

Wrong . Rust remover .. works great. Folks got bad misconceptions of using stuff .

 

[fishing43]

Wrong . Rust remover .. works great. Folks got bad misconceptions of using stuff .

I did some research and you are correct. Good to know about this. Thanks

 

[Hateful McNasty]

I did some research and you are correct. Good to know about this. Thanks

Now them that saying mix the vinegar with baking soda??? I don't get each will neutralize each other so what good is that ? I got a postings on using vinager here somewhere showing how effective it is .. mean rust to shiny.. seems it was a thread on barrel rust or restoring .

As far as pitting.. well depending on the rust it will be the cause of the pitting .

 

[$p00kygH0ST]

fishing43 is right, vinegar is a no no.
It will get rid of the rust, but it will also eat into the steel after the rust has gone, and you can't see what it's doing if it's in the barrel.
The only de-rusting chemical I use is Evaporust, it removes iron oxide but does not etch steel.
I recently de-rusted a BSA Cadet barrel with it. I plugged the barrel, filled it it with Evaporust, left it standing upright for twelve hours, then drained it out and checked the bore. Because it did not take much to fill the bore the process had to be repeated five times.
It will remove blueing, as a friend discovered when he used it to remove light rust from a Webley pistol by putting it into a tray and covering it.

I did some research and you are correct. Good to know about this. Thanks

I guess you could plug the muzzle and fill the barrel with vinegar over night then scrub out with fine oiled steel wool or brass brush then see if your patches come out cleaner . Maybe do this a couple of times .

I had that issue with a Benjamin Prowler.
I cleaned it and shot copper clad pellets through it until I pulled rust free patches, then it shot and actually shot well!
View attachment 510334
A video of my results.

Used a 177 nylon bore brush wrapped in AOA degreaser/clp soaked patches, clipped a composite rod and chucked it in a drill and worked the barrel, did the same with a ballistol soaked mop, brushed again, within 15 patches came out clean. Now the sight elevation issue. Used the lowest profile combo I could use with an LPVO, now shooting 1mil low at 15m. So should be good

Now them that saying mix the vinegar with baking soda??? I don't get each will neutralize each other so what good is that ? I got a postings on using vinager here somewhere showing how effective it is .. mean rust to shiny.. seems it was a thread on barrel rust or restoring .

As far as pitting.. well depending on the rust it will be the cause of the pitting .

Yes. Would be pointless. The sodium bicarb would neutralize the acetic acid and be a stinking, pasty white mess with the same cleaning potential of water.