Heartbreaking...

[tonyben]

I just finished bedding an M40 for a customer who had a new Bartlein barrel installed onto his receiver. Upon re-assembly, I checked the bore to make sure no debris had made its way into the bore. This was an unfired chrom-moly barrel. The bore looked like a sewer pipe!

The company that did the parkerizing did not plug the bore and parkerized the inside of the bore! I would also like to specify that I had no part in the building of this action. I was given the action and stock to bed. Here are pictures of the chamber, throat and bore. This is after I scrubbed it for a half an hour...

We'll see how it shoots, but man, that's a damn shame. I wish I looked into the bore before bedding it.

Tony.

 

[DShortt]

I'd be LIVID with whomever is responsible for the parkerizing.

 

[LVLAaron]

Not sure I'd spend any time trying to fix that.

 

[Sniperhandle]

I just finished bedding an M40 for a customer who had a new Bartlein barrel installed onto his receiver. Upon re-assembly, I checked the bore to make sure no debris had made its way into the bore. This was an unfired chrom-moly barrel. The bore looked like a sewer pipe!

The company that did the parkerizing did not plug the bore and parkerized the inside of the bore! I would also like to specify that I had no part in the building of this action. I was given the action and stock to bed. Here are pictures of the chamber, throat and bore. This is after I scrubbed it for a half an hour...

We'll see how it shoots, but man, that's a damn shame. I wish I looked into the bore before bedding it.

Tony.

That barrel needs to be scrapped, It will foul excessively,I have had experience with this before.

 

[davidjoe]

I’ll be the one to ask the dumb question, why come the outside of the barrel isn’t damaged from the process?

 

[Sniperhandle]

I’ll be the one to ask the dumb question, why come the outside of the barrel isn’t damaged from the process?

I have done a lot of Parkerizing in the past, Parkerizing is a superior finish to bluing because it opens the pores of the metal to receive and hold oil, That is it's function.

The etching process will ruin the inside of a barrel and will never be right.

 

[joshb]

That’s a damn shame. I hope your client gets after them for ruining his new barrel!

 

[Texas Solo]

I got a 300Blk barrel that the chamber was FULL of parkerizing. I called the company. They said " don't worry, it will shoot out".
I sent it back for a refund.

 

[davidjoe]

The etching process will ruin the inside of a barrel and will never be right.

Agree, but the extent of etching in those pictures looks similar to true rust pitting which there is definitely no upside or utility in, doesn’t it? I know it’s magnified, but that’s not as benign a process as I assumed.

 

[tonyben]

I texted him the pictures while he was on the way over here. The company is supposed to get back to him by Monday.

 

[jds holler]

I've only parkerized one rifle, and it was an SKS with chromed bore. And of course it was just an SKS.
The rough texture of a typical parked finish depends largely on the grit of the blast finish that you clean your surface with. You of course wouldn't blast the bore, and presumably it wouldn't be affected to a large degree by the solution. The solution is phosphoric acid, - heated, and I suppose it could be over done. That bore certainly looks like it. I'm drinking a solution of phosphoric acid right now, and loving it.

Plugging a bore to withstand heated solutions can be problematic, but I would for damned sure be doing it with a nice rifle barrel.

With all the great surface treatments these days, parkerization is almost caveman stuff. jd

 

[Sniperhandle]

I've only parkerized one rifle, and it was an SKS with chromed bore. And of course it was just an SKS.
The rough texture of a typical parked finish depends largely on the grit of the blast finish that you clean your surface with. You of course wouldn't blast the bore, and presumably it wouldn't be affected to a large degree by the solution. The solution is phosphoric acid, - heated, and I suppose it could be over done. That bore certainly looks like it. I'm drinking a solution of phosphoric acid right now, and loving it.

Plugging a bore to withstand heated solutions can be problematic, but I would for damned sure be doing it with a nice rifle barrel.

With all the great surface treatments these days, parkerization is almost caveman stuff. jd

I used to drive a lead bullet into the bore on each end, Sealed it perfectly, You could pull the bullet out of the muzzle with a pair of slip joints, Then drive the chamber one out. 45 acp wadcutters worked fine in 30 caliber Garand bores, It would just drive in about 1/4 inch and seal very well and not pop out when it got up to temp.

 

[tonyben]

How do you guys plug the gas port on gas gun barrels?

I’m getting my parkerizing tank next month and will be set up to do gun barrels. I have high temp silicone plugs for the bore and chamber.

 

[jds holler]

I used red high temp silicone. jd

 

[paperpuncher]

I use tapered silicon plugs. Solution is mildly acidic but the barrel is not in the solution for more than 5 minutes typically. Parkerize won’t take very well to a non blasted part in a 5 minutes typical dip. I am surprised to see the condition of that bore but perhaps it sat for sometime exposed to air and residual park solution I have had plugs pop before and never observed a bore like that but I cleaned immediately and oiled. You might reach out to the barrel maker and ask them if they could inspect and maybe re lap to improve the surface finish but it looks like it is toast. If you test it let us k ow how it shoots

 

[Fast14riot]

Might be a case for the fire lapping bullets!