[Edward Tinker]

Years ago stock lugs were removed by owners when they were told by law enforcement, friends, "experts" etc., that owning a gun that could be used with a stock would be illegal. In reality the stock with the wrong gun is what is illegal today, (i.e. in nowadays terms, those guns not approved by the BATF to be legally attached to a stock).

There is a section under General Information on the left links.

Although stock removed Lugers is commonally seen by collectors, many Lugers were never ruined in this way, and thus have more value than a Luger with the lug removed.

Some models did not have a stock lug to start with and further information, serial number, proofs, toggle marking etc., can prove this is a stock removed gun. (Although if the lug is obviously ground, then that is a moot point).