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How to Identify a Lee-Enfield: No. 1 Mk III vs. No. 4 (and the Look-Alikes)

The British Commonwealth's service rifle for the better part of six decades, built in England, Australia, Canada, India and even the United States. Most Lee-Enfields you will meet are one of two models, and you can tell which from across the room. The markings then tell you who built it, when, and whether it is really what the seller says it is.

Why this rifle matters

The Lee-Enfield paired James Paris Lee's rear-locking bolt and detachable box magazine with Enfield-pattern rifling, and the British Army carried versions of it from the 1890s into the 1950s, through both world wars. Its reputation rests on speed: the bolt is short, smooth and cocks on closing, and the magazine holds ten rounds of .303 British, twice what most of its bolt-action rivals held. Before WWI, British musketry training famously expected a trained rifleman to put fifteen aimed rounds on a target at 300 yards in a single minute — the "mad minute." Compare its contemporaries in our Mauser K98k, 1903 Springfield and Mosin-Nagant guides.

1. The fastest tell: look at the muzzle

• No. 1 Mk III (SMLE): the forend wood runs nearly to the muzzle and ends in a blunt steel nose cap with protective "ears" around the front sight and a lug for the long Pattern 1907 sword bayonet. Almost no bare barrel shows. The rear sight sits on the barrel, ahead of the receiver.
• No. 4: several inches of bare barrel protrude past the wood, with a small lug for a spike bayonet near the muzzle. The rear sight is an aperture (peep) sight on the receiver bridge, just in front of your eye, either a flip-up battle sight or a taller ladder sight. The rifle looks plainer and heavier.

One caution: a sporterized No. 1, with the nose cap removed and the forend cut back, can show bare barrel at the muzzle and pass for a No. 4 at a glance. The rear sight settles it — on the barrel means No. 1, on the receiver means No. 4 — and so does where the markings are.

2. Reading a No. 1 Mk III (SMLE)

Look at the right side of the butt socket, the rear of the action where the stock fits. A typical No. 1 reads like a stack: a crown over a royal cypher ("GR" for King George), the maker, the year, and the model, for example "ENFIELD 1917 SHT LE III*".

• "SHT LE" stands for Short, Lee-Enfield. "Short" refers to the rifle's length between the old long rifle and a carbine, not to a cut-down gun.
• "III" vs. "III*": the Mk III dates from 1907. The Mk III* of 1916 was the wartime simplification, deleting the magazine cut-off and the long-range volley sights on the left side of the stock. Most surviving rifles are III*.
• Makers: Enfield (the Royal Small Arms Factory), BSA and LSA (London Small Arms) in Britain, Lithgow in Australia, and Ishapore (often "RFI", Rifle Factory Ishapore) in India.
• The name change: the British renamed the rifle "Rifle No. 1 Mk III" in 1926, so period paperwork may call the same rifle an SMLE or a No. 1.

3. Reading a No. 4

The No. 4 Mk I was the WWII rifle, mass-produced from 1941. Its markings move to the left side of the receiver, which carries the model ("No4 MkI" or "No4 MkI*") and the maker.

• British makers: the Royal Ordnance Factories at Fazakerley and Maltby, marked with "F" or "M", and BSA's Shirley plant, which used the wartime code "M47C" instead of its name.
• Canada: Long Branch, spelled out on the receiver.
• United States: Savage built No. 4 rifles for Britain under Lend-Lease; they are marked "U.S. PROPERTY". A US-made rifle in British service surprises a lot of first-time owners.
• "Mk I*" marks the North American simplification: Long Branch and Savage replaced the bolt-head release catch with a simpler notch in the receiver, which made the rifle faster to build.

Proof marks, the broad-arrow government property mark and the "FTR" (Factory Thorough Repair) rebuild stamp are covered in our surplus rifle markings guide.

4. The look-alikes

• No. 5 Mk I "Jungle Carbine" (1944–47): a shortened, lightened No. 4 with a flared conical flash hider, lightening cuts on the receiver and barrel, and a rubber butt pad. A genuine one is marked "No5 MkI" on the left side of the receiver.
• Postwar "jungle carbine" conversions: US importers cut down surplus No. 4 rifles and added flash hiders to meet demand; the best-known were sold under the "Santa Fe" name. If the receiver says No. 4, it is a No. 4, whatever the muzzle looks like, and it is worth a fraction of a real No. 5.
• Ishapore 2A and 2A1: India's 1960s rifles on the No. 1 pattern, but chambered in 7.62×51mm NATO, not .303. The giveaway is the magazine: squarer and nearly straight, where the .303 magazine is curved for its rimmed cartridge. The two cartridges are not interchangeable, so read the chambering mark before buying ammunition, and have an old rifle checked by a gunsmith before firing it.

Value reference (2026 US market, approximate)

Values are for honest, original-condition rifles with matching numbers. Sporterized rifles (cut forend, drilled for a scope) drop sharply, and a refinish costs more value than it adds. Scarce makers and dates, and documented arsenal rebuilds, sit at the top of each range.

For maker, date and variant detail down to the individual part, Ian Skennerton's The Lee-Enfield Story is the reference most collectors start with.

Disclosure: GoBallistic earns a small commission when you buy through the link above, at no additional cost to you. Helps keep the app free.

So what do you have?

Start at the muzzle: a nose cap means No. 1, bare barrel means No. 4 (or a cut-down No. 1, so check the rear sight). Then read the markings where that model keeps them, the right side of the butt socket on a No. 1 or the left side of the receiver on a No. 4, for the maker and the date. If it has a flash hider and a short barrel, the receiver marking decides whether it is a No. 5 or a conversion.

The SMLE is on screen too: it is the rifle carried through Sam Mendes' 1917 and Christopher Nolan's Dunkirk. If yours came home with a relative after the war, our war bring-back firearm guide covers the paperwork side.