Why disquise serial number?
Welcome to the forum, Antique Wheels. (Do you prefer to be called your full moniker, or a contraction like "Antique" or "Wheels"?, or just "Teek", perhaps?)
I have wondered the same thing about serial numbers. But it never bothered me too much.
1) Because other people do it. Must be some reason I may not understand, but I will do it too.
2) General caution. Better safe than sorry. I don't know what inconvenience having a serial number floating out there might cause, but it costs little or nothing to "X" it out.
3) Same sort of reason you might blot out the license plate on your car in a picture posted online. General privacy.
4) Specific paranoia. I don't want anyone being able to connect any particular gun to me. The "jack-booted thugs" of the BATFE are combing these forums creating a defacto registration database anticipating the day they will come to my door with a list of guns I own demanding confiscation of my guns AND my aluminum foil hat.
That last one is far-fetched, as it violates federal law specifically telling BATFE not to create such a database. ATF would never break the law. And I don't have a foil hat (some people wear them to prevent mind control). It doesn't work, anyway.
On the other hand, there is the student (Mr. Wahlberg) at Central Connecticut State University (CCSU) who, after a Communication 140 class assignment to make a report on a “relevant issue in the media”, chose the Virginia Tech shootings. His presentation on October 3, 2008 posited that if students and/or professors had legal guns on their persons in 2007, the death toll in the Virginia Tech shooting spree could have been much lower. Later on, he was called down to the the campus police offices and interviewed. One of the things that disturbed Wahlberg was that the campus police had a list of all the firearms he owned. I doubt he will ever list a serial number in a post.
http://therecorderonline.net/2009/02/24/professor-called-police-after-student-presentation/
or paste this into your web browser
therecorderonline.net/2009/02/24/professor-called-police-after-student-presentation/
and
renewamerica.us/columns/huston/090306
Lost Sheep