How to recover a filed off SERIAL NUMBER ?

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Old gun with a serial number, but someone has ground down the number so its not readable. Seems like gunsmiths had a technique, a mild acid, or and x ray, or something else, to be able to bring the serial number out.

Help, for all you knowledgeable people, tell me how they do it. Can't call Abby at NCIS on this one.......

Yes, I know this brings out the comments on "it's stolen" and we will handle this within the law. Deceased person, executor of the estate needs some help. Obviously the owner is dead, so they are not available for giving input.

Asking for a friend.
 
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The traditional method is acid etching. X-ray is a backup. A new technology described in the WaPo link describes an electron microscope method using “backscattering”.

https://www.washingtonpost.com/nati...ory.html?noredirect=on&utm_term=.21ad6773c85a

None of these methods, as far as I know, are in use by gunsmiths or civilians. They are used by crime labs, and pretty well-equipped ones at that.

Before any further research, even as an executor of an estate, I would contact an attorney on how to proceed. The penalties for possession may be just as severe as for ownership. The sentimental or even collector’s value of a gun is almost meaningless to the BATF and crime labs. It is probably not persuasive for a lighter or differential application of the laws regarding serial numbers. One would have to weigh risks vs. rewards when traveling through this area of the law.
 
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So, ignoring the legal issue of an obliterated serial number and speaking only to the technical aspects or "recovering" the number...

Depending upon the way the number was defaced and how deep it is, material, etc. it also may be impossible. There are many ways to do it but most all will require a level of expertise and equipment/supplies not readily on hand for an individual. I am not aware of any "business" that does such a service for individuals and outside of the law enforcement community.

Good luck.

https://forensicresources.org/wp-content/uploads/2019/07/Serial-Number-Restoration-09-22-2017.pdf

RECOVERY OF DEFACED SERIAL NUMBERS USING INFRARED THERMAL IMAGING | National Institute of Justice
 
To my knowledge there is no legal way for a civilian to restore a serial number, it can only be done by petitioning ATF with a case to be made of extraordinary historical significance of the firearm. The first question to answer is the age of the firearm; if all of that particular model were manufactured prior to 1898 then it would legally be considered an antiquity not subject to regulation and would therefor be legal. My advice as extreme as it may sound would be to contact ATF and explain the situation so that you do not get yourself in trouble. Keep in mind that ATF is a federal regulatory agency and they can be problematic to deal with (to say the least!).
 
To my knowledge there is no legal way for a civilian to restore a serial number, it can only be done by petitioning ATF with a case to be made of extraordinary historical significance of the firearm. The first question to answer is the age of the firearm; if all of that particular model were manufactured prior to 1898 then it would legally be considered an antiquity not subject to regulation and would therefor be legal. My advice as extreme as it may sound would be to contact ATF and explain the situation so that you do not get yourself in trouble. Keep in mind that ATF is a federal regulatory agency and they can be problematic to deal with (to say the least!).

Do NOT personally contact the ATF on this issue.
 
Old gun with a serial number, but someone has ground down the number so its not readable. Seems like gunsmiths had a technique, a mild acid, or and x ray, or something else, to be able to bring the serial number out.

Help, for all you knowledgeable people, tell me how they do it. Can't call Abby at NCIS on this one.......

Yes, I know this brings out the comments on "it's stolen" and we will handle this within the law. Deceased person, executor of the estate needs some help. Obviously the owner is dead, so they are not available for giving input.

Asking for a friend.
The question of intent will come up at some point. If it was “ground down” intentionally so that the deceased had an untraceable firearm, then that pretty well paints it in a very negative and criminal light regardless of age.

If on the other hand the serial was “ground down” as a result of rust removal and or refinishing, then that carries an entirely different intent. In that case being old and unreadable might it less likely for possession to be viewed as a crime provided:
- it is pre 1898 *and* is not considered a firearm;
- it never had a serial number to begin with;
- it was a home built firearm that did not fall under the NFA and did not (and still does not) require a serial number; or
- it has never been used in interstate commerce after the serial was obliterated (this one is really tricky).

Serial numbers were not required prior to the NFA of 1934 and then only on weapons that fell under the NFA.

The GCA of 1968 required all firearms to have serial numbers and made it illegal to possess a firearm where a serial number had been removed. Prior removal wasn’t punishable as it would be an ex post facto offense, but possession going forward was illegal. That meant firearms with obliterated serial numbers were legal to own on 10-21-1968 but were illegal to own on or after 10-22-1968. But there’s a loop hole based on 18 U.S.C. 922 (k):

“It shall be unlawful for any person knowingly to transport, ship, or receive, in interstate or foreign commerce, any firearm which has had the importer’s or manufacturer’s serial number removed, obliterated, or altered or to possess or receive any firearm which has had the importer’s or manufacturer’s serial number removed, obliterated, or altered and has, at any time, been shipped or transported in interstate or foreign commerce.”

In short, the government avoiding a “Taking” by using congresses innumerated powers under the commerce clause as the legal basis, as it avoided a compensable taking from occurring. If it had taken a broader interpretation separate from interstate commerce, it would have not only been a taking but been a compensable taking as well.

Based on a narrow technicality then you could argue that possessing the weapon or even transferring it within the state would be legal as it does not involve interstate commerce.

Realistically though, ATF will jump on you with both feet and assume it has been used in interstate commerce in the past, and more or less leave it to you as a defendant to prove otherwise wise, ignoring a so called presumption of innocence.

Government agencies have deep pockets and lots of attorneys and they know they can wear you down over a period of years while they keep turning the screws and running up your legal bills until you agree to a plea or settlement. Even if you out last them and win in court, they’ll stall for years if ordered to pay your legal fees, and will als probably ensure that anyone associated with your unlawful prosecution has time to move their assets into someone else’s name before a decision is rendered giving you a right to sue them, so that there is nothing for you to go after. It’s a rigged system.
 
Do NOT personally contact the ATF on this issue.
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Good advice. Ask a lawyer to call the ATF. They can't make a lawyer divulge the identity of the client or the whereabouts of the gun.

Alternatively, unless the piece is really something special, you can "deactivate" it (there's a better word as I recall) and make it a decorative piece.

Deactivation would include removing the firing pin or otherwise breaking it and pouring lead or solder into the barrel to cause it to be unable to permit bullets to pass through. Then it's not a firearm any longer and can be placed on a bookshelf. ICBW BIDTS
 
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I won't go into legal issues about it. If you sanded the area smooth to say 600 or 1200 grit and soak it in ferric chloride diluted 50/50 with white vinegar the serial number might show up. Ferric chloride is available at better electronics shops. Do not polish with power equipment
 
Just for reference I was looking on line at a 1903 Colt and the serial number looked weird. I asked about it and was told it had been ground and the number “recovered”. Not sure who or how it we acomplished.
 
A local shop offered me a Remington Rand 1911A1 with the serial number missing. It could have been done by the G.I. that orignally stole it or some thief a couple weeks ago. Who knows? The shop owner tried to convince me that the holsters were bad to wear the serial number off. I'm not sure if he actually believed that one or just thought I would. I'm not sure how he planned to document that one in his bound book.
 
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Old gun with a serial number, but someone has ground down the number so its not readable. Seems like gunsmiths had a technique, a mild acid, or and x ray, or something else, to be able to bring the serial number out.

Help, for all you knowledgeable people, tell me how they do it. Can't call Abby at NCIS on this one.......

Yes, I know this brings out the comments on "it's stolen" and we will handle this within the law. Deceased person, executor of the estate needs some help. Obviously the owner is dead, so they are not available for giving input.

Asking for a friend.

Now that I hope we've gotten past all the bloviating on the question you didn't ask, here's what you wanted to know:

1. This can be done with nitric acid, or "nicodate" sold in coin shops. After application, the # will magically appear. It's actually exposing the compressed metal from the stamping appear in a contrasting darker gray to the surrounding metal.
Is this a legal serial number?

2. Fry's reagent "serial number restoration fluid."
FRY'S REAGENT RESTORATION FLUID - 2 OZ

Development of new reagent for restoration of erased serial number on metal plates - ScienceDirect
Where to buy: fry's reagent where to buy - Google Search

3. Another method is to very fine bead blast the area where the s/n was with a very fine grit. Again it will show contrasting shades of gray.
 
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Old gun with a serial number, but someone has ground down the number so its not readable. Seems like gunsmiths had a technique, a mild acid, or and x ray, or something else, to be able to bring the serial number out. Asking for a friend.

You have not id the firearm as to make and model thus I'm wondering if the serial number is located elsewhere on the firearm, and can thus be ID' from that location. For example some Mauser rifles had the serial number on both the receiver and the barrel as well as partials on other parts. Could this also be the case.
 
It might be stolen, it might not be, but that's not the issue. The gun is not legal for a private citizen to posses, so it must be surrendered to your local law enforcement agency . . .

Old gun with a serial number, but someone has ground down the number so its not readable. Seems like gunsmiths had a technique, a mild acid, or and x ray, or something else, to be able to bring the serial number out.

Help, for all you knowledgeable people, tell me how they do it. Can't call Abby at NCIS on this one.......

Yes, I know this brings out the comments on "it's stolen" and we will handle this within the law. Deceased person, executor of the estate needs some help. Obviously the owner is dead, so they are not available for giving input.

Asking for a friend.
 
Based on a narrow technicality then you could argue that possessing the weapon or even transferring it within the state would be legal as it does not involve interstate commerce.

This is terrible advice. There's not a commercially manufactured firearm in public possession that has not involved interstate commerce. . . .
 
As mentioned in post #13 above I remember a solution sold in coin shops call Date Restorer or something like that. Many years ago Buffalo Nickels could occasionally be found in circulation. The date was completely worn off on many. When wiped with the solution the date would appear in a contrasting shade of grey to the rest of the area. If this was used on a gun and the original serial number could clearly be read wouldn’t that be good enough to be legal?
 
Here is the method. Depending on type of metal, the acid used is nitric which is diluted or sulfuric that is diluted. First the area where the number was must be polished to a high shine and ideally remain flat. Make a dam around the area as far out as possibly to prevent any acid from reaching other areas of the weapon or other object to be worked on. Use leads from 12 volt batteryand connect them with alligator clips to large cotton swabs which are then dipped in acid. Using the battery power to accelerate the reaction of the acid. In just a few minutes of working with the acid a ghost number in contrast with the polished surface will appear. Take a picture of it and cease using the electolysis with the acid. It is possible that the number will fade away after it appears so don't expect it to stay there indefinitely. It might but more often it will fade away.

That method is used by auto theft investigators to raise obliterated numbers on motorcycle engine casings and on frames. It can be used on things like firearms and that is what forensic specialists would use to try and identify stolen or criminally used items that have the numbers obliterated. Be advised that if the area in question was hit with a welding torch this method won't work. As time went on the people stealing Harley Davidsons started using welding methods to build up the serial number boss after grinding. When they did that they totally ruined any chance of restoring the numbers by Law Enforcement. I would doubt that it would have been done on a firearm.
 
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