Luger stocks, when did some become illegal

[MikeP]

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.