The P14's principal combat use during World War I was as a sniper rifle, since it was found to be more accurate than the Short Magazine Lee–Enfield, either in standard issue form or with modified "fine-adjustment" aperture rearsights designated Pattern 1914 Mk I W (F) and Pattern 1914 Mk I* W (F) or, from April 1918, Aldis Pattern 1918 telescopic sights designated Pattern 1914 Mk I* W (T) (modified and telescopic sights were mainly used on Winchester-manufactured rifles, the Winchesters being thought to be of superior quality). Eventually Winchester manufactured 235,293 rifles, Remington manufactured 400,000 and Eddystone manufactured 600,000, totaling 1,235,293 rifles.