Lee-Enfield No. 4 Rifle

by
posted on February 25, 2010
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
201022517922-leeenfield4rifle_fs.jpg

In 1939, the British soldier was still armed with the same rifle his father, or perhaps even his grandfather, carried. The Short, Magazine Lee Enfield (SMLE) delivered sterling service from the mud of Flanders to the farthest reaches of the Empire. With Hitler’s war machine on the move, the British needed an accurate, mass-production rifle. Thanks to inter-war development, an improved and simplified design was waiting in the wings, and the No. 4 Mark I rifle was adopted on November 15, 1939.

The No. 4 Mk I, chambered in the same .303 British cartridge as the SMLE, retained the better features of the SMLE (in 1926 the SMLE was renamed the No. 1 rifle), but changes were made to the receiver, bolt, stock, sights, barrel, nose cap and bayonet. While being similar in appearance and features, very few parts were completely interchangeable between the No. 4 and No. 1. The No. 4’s receiver was strengthened and squared off; requiring less milling and simplifying manufacture. A simple one-piece charger bridge to accept five-round stripper clips was fitted into grooves on the top of the receiver, as opposed to the No. 1’s rounded bridge. The SMLE’s complex-to-manufacture nose cap was discarded in favor of a milled, and later stamped, front reinforcing band and a simplified sight guard. The No. 4 also had a heavier free-floating barrel, which protruded from the fore-end and eliminated the need for precision full-length bedding.

No. 4s had four types of aperture backsights. The Mk I micrometer backsight was made of milled steel with a battle sight set for 300 yards, which when flipped up was adjustable for elevation out to 1,300 yards. The Mk II had a simple, stamped, two-setting aperture sight. The Mks III and IV were also made from stampings, but, like the Mk I, had provisions for sighting from 300 to 1,300 yards.

New government ordnance factories set up to produce the No. 4 were Royal Ordnance Factory (ROF) Fazakerley in Lancashire and ROF Maltby in Yorkshire. Birmingham Small Arms (B.S.A.) Gun, a private company, also established B.S.A. Shirley in Birmingham to turn out the No. 4. All three began producing No. 4s in 1941. Despite its role in developing the design, the Royal Small Arms Factory Enfield did not produce any of the 2 million-plus No. 4 Mk Is made in England during the war.

In early 1941, while America was still officially neutral, the British Government contracted with Savage Arms Corp. to build 200,000 No. 4 rifles at the former J. Stevens Arms Co. factory in Chicopee Falls, Mass. After the entry of the U.S. into the war, Savage continued to make the No. 4 under the auspices of lend-lease agreements. The lend-lease Savage-made rifles were marked “U.S. Property.” Long Branch Arsenal, located near Toronto in Ontario, Canada, produced about 330,000 No. 4 Mk I and I* rifles. In sum total not only did North American orders bolster British production, but actually exceeded it during the war. The No.4 Mk I* was not actually adopted until 1946, despite being produced at the North American factories as early as 1941. The principal variation was in the method of bolt release. The bolt ribway had a new slot cut for the bolt head to be pivoted upward, out of the ribway. The machining at the rear of the ribway, the bolt-head catch, spring and plate were then no longer necessary.

Disassembly
Disassembly of the unloaded No. 4 Mk I begins with depressing the magazine catch (28) and removing the magazine (35). Open the bolt (10) and move it partially rearward, then depress the bolt release (25) and allow the breechbolt head (6) to ride on its rail over the release. Rotate the breechbolt head upward and draw the bolt assembly rearward and out of the receiver (31). For the No. 4 Mk I*, open the bolt and ease it backward until the breechbolt head lines up with the recess in the bolt guide rail, rotate the bolt head upward and remove the bolt to the rear. It may be necessary to flip the backsight (18) to allow the bolt head to clear the receiver on both the Mk I and Mk I*.

Turn the breechbolt head counterclockwise and off the breechbolt body. Twist the cocking piece (2) until it moves to the lower of its two notches, taking most of the compression off the mainspring (4). Turn out the slotted striker screw (1) on the rear of the cocking piece. The striker (5) is screwed into the cocking piece. There are two notches on either side of the striker’s shoulder about 1 inch down from the striker’s tip. To remove the striker, insert a takedown tool from the front until the projections on either side of its point engage the notches. Then, simply turn out the striker.

Fore-end (38) removal begins with unscrewing the front band swivel screws (41 & 43) and removing the two front barrel bands (40 & 44) and the front sling swivel (42). Next, turn out the front guard screw (36) and the rear guard screw (15), allowing the trigger guard (34) with the trigger (32) attached to be pulled off of the fore-end. The fore-end is now free to be pulled off the bottom of the barreled action. To remove the buttstock (53), flip up the buttplate’s (50) trap, insert a long-bladed screwdriver into the recess in the buttstock’s rear and turn out the stock bolt (48) and its washer (49). Reassembly is in the reverse order.

Latest

Gotw Rra Lar 22 Tactical Carbine Web
Gotw Rra Lar 22 Tactical Carbine Web

Gun Of The Week: Rock River Arms LAR-22 Tactical Carbine

This week, we're on the range with the Rock River Arms LAR-22 Tactical Carbine, a rimfire variant of the AR-15 that's designed for reliability and gives enthusiasts a way to shoot affordably.

The Armed Citizen® July 11, 2025

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

Japanese Last-Ditch Small Arms Of World War II

The crude assortment of fighting tools used by the Japanese during World War II give clues of an unprepared and unmatched last-ditch fight that ultimately lead to Allied victory.

Federal Ammunition Awards 2025 Tom Knapp Memorial Scholarships

Federal Ammunition recently awarded the 2025 Tom Knapp Memorial Scholarships to two 4-H shooting sports teen ambassadors.

2025 Optic Of The Year: Burris Eliminator 6

Even as new generation after new generation of Burris Eliminator continued to add more advanced technology and functionality, it remained odd-looking—until the launch of this year’s sixth-generation product, which is the first in the line that can mount atop a rifle using standard 34 mm scope rings.

I Have This Old Gun: Star Model B

Of the many Spanish-made firearms to emerge throughout the 19th and 20th century, one of the most recognizable is the Star Model B, largely due to its similarity to the Colt Model 1911.

Interests



Get the best of American Rifleman delivered to your inbox.