Rifle, No. 4 Mk I was officially adopted in 1941, its action similar to the No.1 Mk III (SMLE), but stronger and easier to mass-produce. Unlike the SMLE, the No 4 Lee–Enfield barrel protruded from the end of the forestock sans nosecap. For easier machining, the charger bridge was no longer rounded. The iron sight line was redesigned and featured a rear receiver aperture battle sight calibrated for 300 yd (274 m) with an additional ladder aperture sight that could be flipped up and was calibrated for 200–1,300 yd (183–1,189 m) in 100 yd (91 m) increments. This sight, like other aperture sights, proved to be faster and more accurate than the typical mid-barrel open rear sight elements sight lines offered by Mauser, previous Lee–Enfields or the Buffington battle sight of the 1903 Springfield.
Due to its heavier barrel, the No. 4 rifle is heavier than the No. 1 Mk. III, largely. Its spike bayonet, essentially a steel rod with a sharp point, was nicknamed pigsticker by Tommy.
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