yes
Usually means rifle, as in K.R.RIF.C. King's Royal Rifle Corps or Rif.c for Rifle Corp.
standard battle rifle of u.s soldiers in WWI was a 1903 Sprinfield bolt action rifle. As for machine guns the most commonly used was a variation of hiram maxims machine gun, but they did use the 1917 browning designed one towards the end of the war
clemenceau
A muzzleloading rifle caplock single shot rifle. At the start of the war, each unit supplied it's own arms, and they could be quite different. Later the rifle was standardized after the Springfield musket.
M1917
tanks
6.5 mm Arisaka Rifle
yes
Lee Enfield 303
Yes
ross rifle
Mauser
The Mauser es340b was a single shot .22 long rifle. It was made too look and feel like a Mauser 98K. It is not a sniper rifle. It is a target rifle.
no
yes
It was a french rifle. Used extensively durin War of the Pacific http://users.skynet.be/HL-Editions/comblain/comblain1.htm