Luger stocks, when did some become illegal
 

The joining of a stock a a large portion of lugers remain illegal. When did the law become inacted? What about individual state laws? When were stock lugs introduced? I read that they remained on for the lugers manufacturing. An easy way to grasp the gun during the blueing.

The National Firearms Act of 1934 established most of the firearms restrictions that exist today. This includes restrictions on Machineguns, silencers, short barreled rifles, short barreled shotguns, hideout guns, destructive and explosive devices, etc.

It was enacted largely due to the Prohibition era gang wars and the use of submachine guns, grenades, etc. that were employed.

The Luger with stock issue comes from restrictions on Short Barreled Rifles.

Party poopers!
 

Are there any firearms that are totally outlawed like heroin or lsd?

Are all stock interchangeable? Like putting a navy on an artillery?

Technically it would be possible to put a navy on an artillery since the stock lugs and irons are identical (with slight hand fitting required in some cases as was necessary on originals). However, I am sure you have read enough posts on this subject to be aware that such a combination is illegal.

Stock lugs were introduced on the 1902 Carbine and the 1903/04 Navy (there is some evidence that lugs were incorporated on certain experimental versions of the Model 1900, but I do not know the particulars). The lug was eliminated on the 1908 Army military contract, but resurrected in late 1913 and remained a feature of Lugers from that date on.

My 1937 Kreighoff has a stock lug. In fact in Gibsons' book the 1945 has a stock lug yet nowhere in his book is picture an attachment anywhere! Here is my 1937 as an example never used!

There is some evidence to support that the stock lugs were left intact so that they would serve as an assembly fixture at the factory. The frames could be placed in a jig while assembling or other activities. The cost of leaving it intact I imagine was minimal

Thats what its looking like!

Except for Carbines, Navys and a few experimentals in the 10,000B range at DWM, the stock lug was not standard until Dec 1913. TH PS: See the For Sale section for a 1913 Erfurt mit lug, in my postings.

I had to give up a mint matching C96 rig in 1966 over this.

I was 18. going into the army and was allowed to "abandon" it without being charged.
I had to 'splain this later when getting a security clearance.
A bunch of Lugers got ruined a some believed the lug itself was a violation and ground them off.