The Lee Enfield No4 Mk 2 differed from the earlier SMLE in the location of the leaf type rear aperature sight, above the bolt. When not in use it folded flat but you had a simple battle sight, a large aperature which would give you a rough aim to get your first shot off.
Raise the sight(which was similar to the sights found on the bren, except the aperature was in the centre) and set your range. While there was no 100yard range mark, it was generally accepted that if you turned the adjusting wheel on the sight, each click was 50m, thus, two clicks below the 200 mark and you were set to 100. However the trajectory of the round was pretty flat at that range and there was little difference between 100 and 200. In practice we always set sights to 200 when firing from the 100. The Zeroing white square was placed at the top of the centre of the target rather than the absolute centre.. The Blade type foresight was protected from damage by very distinctive foresight guards.
Rear Aperature Leaf type sight of the Lee Enfield No 4 Mk 2. The aperature you look through is the small hole. The battle sight is the raised bit to the left on the photo.
