From No4Mk I (T) to L42 AI

I’ve been fortunate enough to know the author of this article for sometime now, his knowledge and collection is nothing less than impressive, im indebted to him for fostering and humoring my understanding of Enfield’s and sometimes my slow uptake……..A Kyhber Pass knock off comes to mind!

From No4 Mk I (T) to L42 AI

By Graeme Barber

This two part article describes how two separate No4 MkI Rifles manufactured at Birmingham Small Arms factory in 1944 were selected then converted into sniper rifles. Part 1 describes the journey for .303 rifle No4 Mk1 (T) # R33857 while Part 2 describes the journey for 7.62 x 51 rifle L42 A1  #K34325.


Part 1 – The .303 No4 MkI (T)

Rifle R33857 – General Description

Caliber: ………………………………. .303 in.

Rifling & Twist: …………………… 5 Groove, Enfield, Left Hand

Barrel Length: …………………….. 25.2 in. (640mm)

Overall Length: …………………… 44.5 in. (1130mm)

Weight: ……………………………….. 11 lb. 10 oz. (5.3kg)

Magazine Capacity: ……………… 10 rounds

Rifle approval date: ……………… February 12th, 1942

Rifle Manufactured ……………B.S.A. Shirley (M 47 C) 1944 # R33857

Rifle Converted: …………………… by Holland & Holland (S51)

Scope: ……………………………………TEL. SGT. No32 MkIII O.S. 2039 A (Mfd by Taylor Hobson and Co) # 24860

Mk III Scope approval date: …. October 7th, 1944

Total Qty No4 (T) Mfd: ………… 23,177 Production from Sept. 22nd, 1942 to March 21st, 1946  – 9861 fitted with MkIII scope  (as calculated by Peter Laidler)


“The Rifle not the Story”

Sniper rifles as described by Terry Warner were made for serious men on a deadly mission.  On the advance, in contact, or in defence, the snipers aggressively pressed the battle to the enemy.  One man or a pair might drop off a patrol, or creep forward to a hide, looking for targets.  Troops relied on THEIR snipers to keep the enemy and HIS snipers at a distance.  No commander had enough snipers, and the ‘schools’ turned good patrollers and shooters into efficient snipers.  Any rifle built in wartime was used hard.  If the sniper lost confidence in his rifle, the armourer had another. As Peter Laidler discovered during his post war training armourers continued to live by the mantle ‘near enough isn’t good enough but exactly right is near enough’. The sniper expected and relied upon perfection. 

In recent years collectors have discovered the allure of collecting the No4 sniper rifle which has caused prices for good quality rifles especially with all Complete Equipment Schedule (CES) items to increase dramatically.

Consequently, there are some rifles of dubious background assembled using some mismatched or reproduction parts. The Latin saying, Caveat Emptor, has never been truer. Ian Skennerton advises, ‘Buy the rifle not the story’. Luckily for collectors and historians the British arms manufacturers were prolific with their use of stamps that now help define the life history of a firearm.

 So lets take a closer look at # R33857 No4 (T) Sniper Rifle






This No4 rifle is one of 665,000 manufactured at Birmingham Small Arms’ plant in Shirley. As 1944 serial numbers are in the 30xxx range prefixed by either of the following –A, C, F, H, K, L, M, P, Q, R – this rifle was manufactured very late in the year. The angular sling swivel on the takedown screw in front of the magazine is another sign the rifle was produced after September 1944.$

If a rifle from two British factories (Maltby and BSA Shirley) was more accurate than average, it was set aside for No4 (T) conversion. Selected rifles had to have a MkI body, a Mk1 rear sight, a 5 groove barrel gauging at .301 inch, a split foresight block with both surfaces on the foresight blade undercut to reduce reflection, and be able to achieve a group of 10 rounds in under 3x 3 inches at 100yards.  

BSA Shirley stamped their ‘M47C’ code, the year of manufacture, 1944, and the rifles serial number R33857 on the butt socket. Prior to dispatching to Holland and Holland a ‘TR’ was also applied by inspectors to the bottom of the butt socket to indicate it had passed the selection criteria.


 Holland and Holland’s workmanship was scrupulously by the book and the quality of the sniper rifles is recognised by all authors as the definitive standard.  Theirs was the only UK-based factory for the No4 (T) except for 1400 (approx) 1930 ‘s dated No4 Trials Rifles converted at the Royal Small Arms Factory Enfield.  Their first contract delivery was in November 1942 and the last in April 1946, likely using a 1945 dated receiver. 

The new arrivals were inspected and only those that met the standard were converted as the contract price did not allow for any swapping or up grading of parts.

The first step was to completely strip the rifle with all parts wired to suitably numbered ex P14 brass butt discs to ensure they were all able to be reunited at the conclusion of the conversion process. The left side of the action body was milled to create a flat surface. For this rifle the model marks, No4 MkI, disappeared leaving only its, barely visible, serial number R33857.

Thanks to Ian Skennerton and Peter Laidler we now have a very precise description of the steps involved in manufacturing and connecting the pads to the rifle. The front pad was sweated on and screwed in place with three raised head 4BA screws. The rear pad cut from a partially shaped steel bar was also sweated in place this time with two flat head 4BA screws. The pads were then machined on to the body to ensure they were parallel, both vertically and horizontally, to the bore. The front pad spigot was machined then drilled and tapped with a ¼ inch BSF hole. The rear pads top and bottom angular surfaces were machined exactly in line with the bore then drilled and tapped through the body as well with a ¼ inch BSF hole.

Staking the end of the 5 screw slots with a pin punch was an uncomplicated way to lock a screw head.  More than one stake per screw head, indicated the pad had been removed or replaced, either for repair or overhaul.  A single stake mark on all screws suggests this rifle was newly converted and not refinished.

The partially finished cast bracket manufactured by Dalglish and Son’s Glasgow had a spigot machined on it that perfectly matched the spigot on the front pad. Following machining for the thumbscrews the bracket was machined and fitted with matched rings stamped 756 & 757 and No32 MkIII scope number 24860 purchased from Taylor, Hobson and Co. There were two other British manufacturers of the MkIII scope – Cooke Troughton & Simms and A. Kershaw & Son. MkIII scopes contained the new style anti backlash mechanism and an improved slipping scale drum. The red painted W signifies waterproofing and the blue painted B on this scope signifies blooming to improve light gathering properties during low light or poor visibility. It has 3x power magnification and an 8inch Field of View (FOV). The range and deflection increments are one Minute of Angle (MOA) which equates to one inch per click at 100 yards.


The scope was then collimated to the rifle to ensure the scope lined up perfectly with the bore. This ‘mating’ process matched rifle and scope for life. As the serial number R 33857 is stamped on the rear leg this would indicate this rifle was converted no earlier than towards the end of the war.


 The battle aperture from the Mk1 back sight was removed to allow the scope to sit as low as possible and surface ground flat prior to blackening via a chemical brunofixing process. Unofficially these modified back sights are described as MkI/I. The 1/8inch ‘S’ stamped on the small flat on the right side of the body indicates after conversion that the iron sights did not need to be re-zeroed.

This rifle was then heated to red hot, around 740 degrees Celsius, then dipped in oil. The mottled finish on this rifle indicates that the oil caught fire during the cooling off process leaving carbonaceous material.

A dark stained beech wooden cheek piece was fitted to this rifles normal length butt measuring 12 ¼ inches using a 1 ¼ inch wood screw in the front and a 1 ½ inch wood screw in the rear.  The Holland and Holland code ‘S 51’ was then stamped in ¼ inch letters on the bottom of the handgrip of the butt. 

The scope number 24860 was stamped on the top of the butt wrist with the rifle number stamped in front of it hidden with in the butt socket.

 As all screws on this rifle bear no evidence of being touch by a screwdriver since conversion I am reluctant to disassemble the rifle. The English Walnut woodwork on this rifle also numbered R33857 still shows fine scratching caused during the cross grain sandpapering process at BSA Shirley.

 The rear sight and scopes were sighted in at 400 yards to ‘guarantee’ a body shot at any range out to 600 yards. With their renowned accuracy the No4 (T) was very capable of putting “round holes in square heads”.

One of three Enfield Examiners examined R33857 and stamped a ‘T’ next to the ejector screw signifying a No.32 telescope had been fitted, and the combination had met all inspections. A final examiners stamp was applied to the right hand rear of the action just in front of the scope number at the wrist. A stamp in this position is only found on No4 rifles that were converted to sniper rifles.

 The last stage of the conversion was to assemble the accessories according to the Complete Equipment Schedule. 







This No4 (T) has a No15 wooden transport chest and a No8 scope case numbered to the scope complete with leather strap and leather scope covers.




Missing from this 1946 dated CES is the canvas protective case (that was too small for a rifle with scope attached), Scout Regiment draw tube telescope, small tin cleaning kit, handkerchief for cleaning the scope lenses and an American M1907 leather loop sling. The butt has a MkII sling swivel to facilitate the use of the loop sling. In its butt trap is an as issued oil bottle and pull through. This completed No4 (T) rifle was valued at 8 pound with the scope, parts and labour accounting for about ¾ of that value.

It is very possible that any sniper rifle found in good condition today was rebuilt more than once in its service life, and its unblemished finish covers the scars and bumps of hard knocks, parachute jumps and long cold nights in a hide. Rifle R33857 and its accessories appear from close scrutiny to be completely matching and un-issued suggesting it avoided dispatch during the post war down sizing of military activity. 

An un-issued condition sniper rifle is in a way an oxymoron as most No4 (T) rifles experienced a lifecycle of storage, issue, use, first, second and third line repair, along with modification programs.  The conversion to 7.62 x 51 NATO, also gave the British a way to extend the life of their .303 sniper rifles.  But that is another story-Part 2 is about my other 1944 BSA No4 (T) that in its extended life was converted to an L42 A1

Additional Information

If a rifle from two British factories (Maltby and BSA Shirley) was more accurate than average, it was set aside for No4 (T) conversion. Selected rifles had to have a MkI body, a Mk1 rear sight, a 5 groove barrel gauging at .301 inch, a split foresight block with both surfaces on the foresight blade undercut to reduce reflection, and be able to achieve hand held rested a group of 5 rounds in under 3 x 3 inches at 100yards. For comparison the
expected standard for No4 service rifles was a group of 6 x 4 inches at 100yards.




  • An Armourers Perspective: .303 No4 (T) Sniper Rifle and the Holland and Holland Connection, by Peter Laidler
  • Telescope Sight No32, An inside view of the Snipers rifle telescope, by Peter Laidler
  • Lee Enfield Story, by Ian Skennerton (
  • The British Sniper, by Ian Skennerton (
  • British Enfield Rifles, Volume 2, Lee Enfield No4 and No5 Rifles, by Charles R. Stratton
  • Is my Lee Enfield Sniper Rifle a Fake? by Terry Warner (

3 Responses to From No4Mk I (T) to L42 AI

  1. Adam Berry says:

    What a treasure trove of information Mark ….hit the nail on the head with this one bud!!! Well Done!!!

  2. ..MJ.. says:

    Well done and good coverage of some of the smaller details so any time you would like to use some of my photos of the ten TR rifles I have just email what you need. I have had some interesting conversations with Dr. Roger Payne and Mr. Laidler too. I’m no expert but I’m lucky to know a few who are still writing or preparing to write some interesting reviews like Nigel Greenaway who writes about the T rifles in UK magazines. Nigel’s user pamphlets for the #4T and L42 are a must to fill out your CES.

    Pura Vida

  3. crusader says:

    I recently purchased what was described as a Mk. 4 No. 1 (T) from the United States sight unseen and fully aware of “caveat emptor” and “buy the rifle not the story”, but I trusted the vendor.

    The “Story” tells me…

    “This gun is one of the last 100 guns built by Holland & Holland, the last 100 were passed onto B.S.A. Shirley and so marked S51 under butt for H&H and M47C for Shirley. This was the second contract for 12,100 rifles in 13th February 1943”.

    “…it was arsenal refurbished by your government before it was exported some 40 plus years ago”.

    “Scope was up graded in the 1950s and so marked in the metal case (1955) / source “The British Sniper” by Ian Skennerton.”

    “…the rifle was upgraded in 1955”.

    “…the Importer …was ‘Ye O’l Hunter’ an importer and dealer”.

    I found an advertisement in the May 1959 issue of the American “Gun” magazine The advert on pages 34 & 35 (specifically see “THE AMAZING ROYAL ENFIELD ORIGINAL No. 4 SNIPER RIFLE WITH SCOPE!” on the top of page 34) makes interesting reading and would seem to support the story. Get the price $44.95 USD – I would buy them now all day long at that price!

    What I received has turned out to be somewhat of an enigma. I have had Thames Valley Guns here in the UK prepare a report on the rifle for me and here is what they had to say:

    Barrel Good internal and external condition. Gauge plug bore .301 passed. Barrel cleaned. Barrel has current UK proof mark.
    Foresight Serviceable
    Stock Serviceable, however screws have been fitted the wrong way and the King screw is loose.
    Receiver Good condition. Pads secure, UK proof mark, no excessive wear. Serviceable.
    Magazine Serviceable.
    Bolt Mechanism Correctly numbered. Passed cartridge headspace. FPP is correct but on the max at .50”. Bolt head is 0. UK proof mark.
    Rear-sight Serviceable
    Optics No32 Scope, Windage not working, scope unserviceable.
    Trigger Mechanism Serviceable, safety catch checked, serviceable although the spring is a little weak
    Trigger Pressure 6.7lbs
    Butt & cheek pad Serviceable
    Extractor/Ejector Serviceable.
    Performance Function tested – serviceable
    History See notes


    Rifles Condition: Serviceable


    1. Barrel is a new replacement, lands are sharp and the lead is fully intact. Crown is undamaged. However the barrel has been numbered to the receiver and stamped M47C. The British discontinued the practice of numbering barrels with the SMLE but I have seen the practice on Longbranch models. I would also question the BSA Shirley stamp.
    2. Foresight block is an Mk1* type and usually not encountered on a No4T.
    3. Fore end is not original, numbers do not match, however the fore end is generally fitted correctly, is undamaged and in good condition. A standard king screw is fitted and is incorrect for the No4T, it should be a king screw with an integral loop. Also the plate underneath the looped king screw is missing. Note ripple effect on finish by receiver.
    4. Receiver is in good condition; however no markings to the receiver wall, pads are secure however staking is in remarkably good condition which is not normal for a rifle of this age, normally multiple stakes would be present, which indicates replacement pads. Receiver appears refinished as this is not the typical MOD finish. “England” and “S” stamp indicates this is a post war export. No US import stamps. Butt socket stamps appear genuine, i.e. correct font. UK proof stamp. Since stripping and cleaning the rifle I have identified the marking in the receiver wall “No4 Mk1”, which lacks the “T” suffix. Have the pads been aligned with the bore correctly?
    5. Magazine is a standard No4 model and has no serial number matching it to the rifle, which was appropriate for the No4T.
    6. Bolt is a replacement, new bolt head, no overturn and has been numbered to the rifle.
    7. Rearsight is a standard rearsight and not a No4T version. The battle sight has been removed but the underside of the sight has not been relieved to allow the removal of the bolt.
    8. Whilst the trigger is serviceable it has not been tuned.
    9. Whilst the butt assembly is serviceable and appears to have the correct rear sling swivel, it is not original and has the following things wrong for a No4T. Scope number is the wrong font and has been over stamped. Cheek pad is beech, has been recently stained and is secured with steel screws. Brass screws are the correct type to avoid corrosion. Butt plate is zinc, normally No4T’s are brass. S51 is the Holland & Holland stamp, it is has been recently stamped and it is very unusual to have a Holland & Holland butt on a BSA rifle.
    10. No32 scope and bracket are original however the windage drum is broken and therefore the scope is unserviceable

    These rifles are seventy years old and in the case of this rifle have been supplied as a “military aid” after British military service. It is normal for parts to be replaced as they wear, so things like woodwork, barrel and bolt will be replaced over the lifecycle of the rifle. At one stage I had hoped that the receiver was a genuine No4T, but after cleaning it reveal the No4Mk1 marking but no “T” suffix. However it appears too many items have been faked on this rifle by a dealer who is clearly inexperienced on the No4T. For example the rearsight has not been machined correctly, the pads are too new, the butt has been clearly faked and the stamping of the barrel is potentially incorrect. Had these parts been replaced under the military aid programme the barrel would not have been stamped, the butt would have been a plain model and I am sure the rearsight would have been machined correctly because the user would not have been able to remove the bolt for cleaning without removing the scope.
    Had some of the stamps been omitted, the seller could have argued that the parts were replaced as a result of fair wear & tear during normal service, however this rifle appears to have been “over faked”

    [End of report]

    I would greatly appreciate and value any comments to assist my understanding of what I have purchased and its’ history.

    At the end of the day what I appear to have is a serviceable rifle in remarkably good condition, but not an original Mk.4 No.1 (T)… as to the cost… don’t ask!

    Thank you in anticipation.

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