Nothing keeping you from starting a thread on M1917s.
The forum is Mausers and Military Rifles. Last I looked M1917s were military rifles.
Your post only asked if the rifles had to be in military dress, nothing about M1917s and your first picture appears to be a 96 Swede.
I stand by my statement that both sported and military dress rifles have been posted.

Last edited by WTF; 06/10/19.