We’ve looked at a few cutaways in the past, today we’re going to take a look at a Lee-Enfield Rifle No.4 cutaway.
One of the main drawbacks of the venerable SMLE was that it was expensive and time consuming to manufacture. The No.4 was an attempt to address this. It evolved from the experimental No.1 MkV and MkVI which were trialled in the early 1920s. The key mechanical change was that the barrel was free-floated and had a heavier profile to deal with expansion of the stock. The No.4 also had a new rear aperture sight mounted further back on the receiver giving a better sight picture and a longer sight radius.
With this cutaway we get a look inside the butt trap, which has a pull-through and oil bottle inside, then as we move to the action we get a look at the rifle’s trigger, sear, sear spring and magazine catch. If we look closely we can see the bolt head catch. The magazine has also been cutaway, with the magazine follower spring just visible.
This cutaway rifle has had all of the wood around its receiver removed, so we can see the magazine housing floor plate and the point where the retaining screw attaches to the trunnion. As we move along we get a look inside the chamber where the outline of the cartridge neck is easy to see and we can also see the barrel’s rifling too.
Down near the muzzle the rifle’s upper retaining band and the hand guard have been cutaway to show the barrel inside. The No.4 was adopted for service officially in November 1939 and just over 4 million were made during WW2. We’ll have a full, more in-depth video on the No.4 in the future.
This week TAB hit 4,000 subscribers! Thanks for all your support over the last couple of years. I filmed this update on Tuesday during a recent research trip in the south of England. I visited Fort Nelson near Portsmouth and thought I’d film a quick update while I stopped for a break.
Today, we have a short video looking at Fort Clinch, a fort built at the mouth of the St Mary’s river in North eastern Florida. The pentagonal masonry fort defends the strategic position on Amelia Island, at the mouth of the river and Cumberland sound.
While the site had been fortified by the Spanish in the 1730s, construction of the present fort began in 1847 after the end of the Second Seminole War. Built as part of the Third System of coastal defences, which began in the 1820s and was characterised by building thick masonry walls. Clinch is one of the smaller forts that were built to defend less important harbours. Named after General Duncan Lamont Clinch, the fort wasn’t fully completed until 1869.
During the civil war it was originally held by the Confederacy before they abandoned it and it was taken over by the Union in spring 1862. The Union then set about finishing the fort. While some sources suggest it was designed to mount as many as 70 guns, it was never fully equipped but we can see that it has mounts and barbettes for around 40 guns on its ramparts.
Today, the fort has a handful of Rodman guns in place. The guns appear to be mounted on front-pintle barbette carriages. Beneath the guns are ammunition casements; powder rooms and shot stores, the holes for bringing up ammunition can still be seen.
Rodman guns were a staple of US coastal forts during the late 19th century, designed by Thomas Jackson Rodman, they were hollow cast and much stronger than earlier, traditionally cast guns. They were produced in a variety of calibres ranging from small 8 and 10in guns to huge 15 and even 20in guns. They were designed to be fired from behind a parapet, giving the crew some protection, the parapet at Fort Clinch is missing. The guns themselves were smoothbore and were designed to fire round shot and explosive shell. They would have been manned by an 8-man crew and, depending on calibre, had a range of over 4,000 yards.
In 1864, Major-General John Foster, a veteran of the Siege of Fort Sumter, reported that the fort was poorly sited and its design was flawed. It’s clear to see that the fort’s brick walls certainly wouldn’t have withstood fire from rifled artillery for long.
The fort never saw action and once finished wasn’t garrisoned again until 1898 during the Spanish-American War, when a 8″ Rifled Cannon Emplacement with a concrete gun shield was built. The fort was subsequently abandoned again and began to deteriorate until the 1930s when it became part of a state park and was renovated by the Civilian Conservation Corps.
September 3, 1864: Foster relates the “main defects” of Fort Clinch, Florida, To the Sound of the Guns, (source)
Map of the Entrance to Cumberland Sound Ga. & Fl., Tampa Bay History Centre, (source)
While doing some research in the US National Archives’ online catalogue I came across a very interesting video composed of footage from a couple of US Army Ordnance demonstrations so I thought I’d take the opportunity to talk about some very big guns.
Railway guns emerged during the late 19th century as a way of moving massive, large calibre guns which had a reach far beyond that of field artillery. Before aircraft were able to effectively attack behind enemy lines railways allowed armies to bring huge guns within range and harass their enemies lines of communication and supply.
This footage comes from Ordnance demonstrations at the Aberdeen Proving Ground in the early 1920s.
First up we have a US-built copy of the French 305mm Canon de 305 modèle 1893/96 à glissement, which according the original footage notes, was a 10in sliding mount for a gun firing a 150lb projectile. I also found some contemporary images of the gun being built at the US Watertown Arsenal, in Massachusetts, which describes it as the Model 1919. It may be the only example built by the US, Schneider built 8 of these guns for France during the war. When the gun fires we can see the whole gun and carriage recoil back a meter or so. Guns on sliding mounts cant be traversed and have to be aimed with specially laid track.
Next we have a 12 inch M1895 gun, mounted on a M1918 railway carriage which was based on the French Batignolles mount, with 360-degree traverse. Originally designed as a coastal defence gun, here’s a photograph taken in 1918 of the gun firing from a disappearing mount.
The M1895 had long been used as a coastal defence gun, and with US entry into the war surplus or unnecessary coastal guns were remounted as railway guns. The railway mounted M1895s had a large recuperator to mitigate the gun’s recoil. 12 were mounted, however, none reached France before the end of the war. We also get a nice shot of the shell hitting its target in the distance.
The 14 inch railway guns were the only big US guns to see action during WW1. Taking spare US Navy 14in naval guns, the 14″/50 caliber Mk 4 gun, which had been mounted in the New Mexico and Tennessee-class battleships, and mounting them in a carriage built by the Baldwin Locomotive Works. Once in position the guns had to have a recoil pit dug out beneath the carriage to allow space for the gun to recoil when it was at high elevation. They had a range of up to 25 miles.
Five Mk1 guns made it to France operating as single gun batteries manned by US Navy Sailors. The guns fired a total of 782 shells during the war, with Battery 4 firing its last shell at 10:57:30 a.m. on 11 November 1918.
Unlike the MkI guns that made it to France in this footage we see the gun without an armoured gun house, with the gunners working the gun in the open.
Finally, we have the truly massive 16 inch M1919 coastal gun . Designed for the Army Coast Artillery Corps to defend the US’ major coastal ports the 16-inch gun could throw a 2,340 lb shell up to 28 miles. In this footage we can see the gun mounted on an M1919 barbette carriage which could be elevated up to 65-degrees.
This second piece of footage dates from between 1929 and 1931, with dozens of West Point cadets gathered eagerly to see the gun in action.
We’re all familiar with the Heckler & Koch G3 and its roller-delayed blowback action. What is less well-known is that H&K were one of two companies originally contracted by the West German government to produce the Bundeswehr’s new service rifle. The other company was Rheinmetall and today we’re lucky enough to be taking a look at an example of an early production Rheinmetall G3.
The rifle which became the G3 was of course originally developed by German and Spanish engineers working at the Centro de Estudios Tecnicos de Materiales Especiales (CETME) and was intended to equip the Spanish armed forces. Initially, the West German Bundesgrenzschutz (border guards) were interested in purchasing a substantial number of the new CETME rifles, with an initial order for 5,000 agreed, however, in September 1955 the order was cancelled due to delays in production and the Bundesgrenzschutz subsequently ordered the FN FAL instead.
In November 1955, the Bundeswehr (West German military) was formed and began to search for a suitable new 7.62x51mm service rifle. Having observed the Bundesgrenzschutz’ testing the fledgling Bundeswehr took an interest in the CETEME rifle. 400 ‘STG CETME’ rifles were ordered for troop trials and these were assembled in Germany by Heckler & Koch. The rifles were delivered in late 1956, and comparative trials against the FAL began the following year.
The trials found the ‘STG CETME’ to be satisfactory in terms of features and design but lacking in durability. A number of small changes were requested including a flash hider suitable for launching rifle grenades, either a flip-up or dioptre rear sight instead of a traditional tangent style, a case deflector, a simpler more ergonomic pistol grip, a longer more ergonomic cocking handle, changes to the recoil spring guide and tweaks to the shape of the buttstock. Additional improvements such as a stronger bipod, lighter magazine, a last round hold open mechanism, overall lightening of the rifle, a lighter 20-round magazine and a proper handguard were also requested.
FN were unwilling to grant Germany a manufacturing license and the $110 per rifle price for the FAL proved substantially higher than CETME’s production estimates (The ArmaLite AR-10, J. Putnam Evans (2016), p.204). With adoption looking likely, legal wrangling over patent ownership began between Mauser, Rheinmetall and Heckler & Koch. All claimed the ownership of the roller-delayed blowback principle used by the CETME rifle. Eventually, however, the West German government awarded Rheinmetall and H&K future production contracts for the new rifle with the government supporting H&K’s claims but the legal battles continued for almost a decade.
In the meantime, with production of the CETME rifle not yet initiated and in light of some durability/reliability issues suffered during the STG CETME’s troop trials, 100,000 ‘Series C’ FN FALs were ordered for the Bundeswehr in late 1956. In 1957 the Swiss SIG 510 (designated the G2) and the American ArmaLite AR-10 (designated the G4) were also evaluated. Once the modifications requested after the troops trials were completed by H&K, a run of twenty rifles was produced and tested again.
In 1959, the West German government finally adopted the CETME rifle, designating it the G3. The German federal government decided that they wished to purchase the worldwide manufacturing rights to the G3, which naturally the Spanish government was reluctant to agree to. An agreement was finally reached in January 1958 and the contract giving West Germany worldwide rights to the G3 was finalised on February 4th, 1959.
One issue was that in June 1957, CETME had agreed a licensing deal for manufacture and sale of the rifle with a with a Dutch company Nederlandsche Wapen en Munitiefabriek (NWM). In order to gain the manufacturing rights sold to NWM the German government awarded the Dutch company a lucrative contract producing 20mm ammunition (Full Circle, p.234).
Interestingly, as the German government owned the manufacturing rights, H&K initially had to pay the government 4 Deutsche Marks per rifle, despite having been awarded the contract by the German government. In late January 1959, H&K were awarded the first substantial production contract, amounting to 150,000 rifles. Rheinmetall were subsequently awarded a similar contract (Full Circle, p.235).
According to R. Blake Stevens’ book on the roller-delayed blowback action, Full Circle, Rheinmetall produced 500,000 G3s during the 1960s, delivering 8,000 rifles per month (Full Circle, p.287). As H&K had been designated as the technical lead on the G3 project, Rheinmetall’s engineers made no attempts to develop modifications or improvements and even when H&K had switched to plastic furniture the Rheinmetall guns continued to use wood. Rheinmetall’s only other G3-related project was the RH4, a 7.62x39mm chambered, roller-locked but gas-operated rifle designed for export (Historical Firearms).
In addition to the G3, Rheinmetall were the sole manufacturer of the MG3, the 7.62x51mm MG42. Blake Stevens explains that in 1969, when a new tender for G3 production was due, that H&K moved to undercut Rheinmetall who had until now held the monopoly on MG3 production (Full Circle, p.292). As a result an agreement was reached where Rheinmetall retained their monopoly on MG3 production and H&K became sole manufacturer of the G3 for the West German military.
Examining An Early Production Rheinmetall G3
The G3 went through a large number of changes both before and after it went into service. The rifle we’re examining today is a good example of an early production rifle, as adopted in 1959. This rifle is lightly marked with ‘G3 [Rheinmetall’s ‘star-in-a-circle’ logo] followed by a serial number of 745 and below that it is date marked with the ‘3/60’, for March 1960.
Working our way from the muzzle back; the rifle has the early style of flash-hider/grenade launcher support which was introduced in 1957 and altered in early 1961, an enclosed front sight and a detachable bipod (which was not Bundeswehr general issue). It has a stamped metal handguard which was replaced by one with a wooden insert in 1961, before H&K introduced plastic furniture in 1964.
The folding carrying handle seen on the troop trials rifles has been removed, the receiver is stepped for the attachment of a scope base and the magazine housing has a single strengthening rib, rather than the later ‘full-frame’ continuous rib. It has an S-E-F selector (S – Sicher/safe, E – Einzelfeuer/semi, F – Feuerstoß/auto) and black plastic pistol grip. Internally, the rifle has a captive mainspring. Unlike later G3’s the rifle has a 2-position folding L-shape rear aperture sight with apertures for 200 & 300 metres rather than the later dioptre sight adopted officially in mid-1960. The rifle has a wooden stock held with a stamped metal sling attachment and a plastic buttplate.
While I was doing some research in the US National Archives’ catalogue, for footage of the Ford M1918 Light Tank, I came across this snippet of film. As we saw in our earlier video on the M1918 the tank struggled to deal with some terrain. In this video we see that at one point the prototype 3-ton tank managed to flip over completely! Which begs the question, how many men does it take to flip a tank?
….The answer appears to be around 20! The tank was relatively light, weighing in at 3 tons, but I still don’t think think I would have been one of them men pulling the tank’s track towards them!
Development of the gun actually began before the war in 1938, but the QF 6pdr MkII Anti-Tank gun didn’t enter full production until 1942. After the evacuation from Dunkirk in the summer of 1940, and the loss of nearly 600 AT guns, it was decided to focus on the 2pdr which was then already in production. The 6pdr saw action for the first time in the Western Desert against the Afrika Korps, serving alongside its predecessor the 2pdr.
The 6pdr was a 57mm gun, firing a 57x441mmR shell effective out to 1,700 yards or 1,500m – with a rated maximum range of 5,000 yd. Unlike its predecessor the 6pdr could fire both armour piercing and high explosive rounds. The gun weighed in at 2,520 lb or just under 1,150 kg. Manned by a six man crew the gun had a vertically sliding breechblock and could fire up to 15 rounds per minute.
The 6pdr had a Hydro-pneumatic recuperator which mitigated some of the gun’s recoil. The barrel recoiled around 30 inches along its cradle immediately after firing. It was mounted on a variety of carriages with the most common being a split trail carriage with 45-degrees of traverse left and right. The 6pdr could be fired with its split trail deployed or closed. The gun could be elevated 15-degrees and depressed 5-degrees – less than its predecessor, although elevation was not a key requirement for a direct fire weapon like an anti-tank gun.
Five Marks of 6pdr were produced, the MkI development model was declared obsolete and didn’t enter production. Production of the MkII began in late 1941, it had a shorter barrel and was later replaced by the longer barrelled MkIV, which also had a single-baffle muzzle brake, one of the first British guns to have one. The MkIII and V variants had special lugs to enable them to be mounted in tanks. The first guns produced were MkIIIs, while these could be carriage mounted they were earmarked for tanks.
The MkIII Airborne carriage was designed to be lighter so it could be transported aboard gliders and aircraft. Its trail legs were jointed in order to save room and the carriage was narrower which restricted the traverse to 37-degrees left or right. The shield was also redesigned with an even smaller profile. Identifiable by its straight, rather than wavy, top edge.
The gun was aimed using a No.22C 2 or 3-power sighting telescope, located on the left side of the gun, which projected through a sight box in the shield. The gunner also had an elevation wheel to his right and, unlike the 2pdr, the 6pdr used a free traverse rather than a geared wheel system. This was controlled by the gunner pushing or pulling the gun. The gun was fired by a firing lever on the left side of the breech. On the right side of the gun, an ammunition box with space for three rounds could be attached to the shield for emergency use. The gun shield consisted of two/four sections, made of bulletproof steel plate, which had a lower profile than the earlier 2pdr.
Unlike the 2pdr, the 6pdr had an array of ammunition that continued to evolve during the war. The initial armour piercing round could penetrate 70mm or 2.8in of armour at 1,600 yards / 1,500m while the Armour-Piercing Capped Ballistic Cap (APCBC) introduced in early 1943 increased this to 3.1in, while the Armour-Piercing, Discarding Sabot (APDS) shot introduced in Spring 1944, enabled it to effectively engage Tiger I and Panther frontal armour, penetrating 4.8 inches of armour at 1,500m. It is worth noting that figures on penetration vary somewhat from source to source. A high explosive shell that allowed the guns to engage non-armoured targets more effectively was introduced in 1943.
Initially used solely by the Royal Artillery’s anti-tank regiments comprising of four batteries, each with 12 guns. By 1944 an infantry division would be equipped with as many as 78 6pdrs and more than 30 heavier 17pdrs while an armoured divisions was equipped with 30 6pdrs.
The 6pdrs first saw action in North Africa proving to be highly effective against both Italian and German armour. During the Second Battle of El Alamein, 19 6pdrs were instrumental in the defence of Outpost Snipe. The 2nd Rifle Brigade and their supporting 6pdrs managed to knock out more than 55 Axis armoured vehicles including Panzer IIIs, Semovente 75/18 self-propelled guns and a number of Panzer IVs. The gunners used enfilading fire to target weaker side armour and interlocked fields of fire caught advancing tanks in killing grounds.
During Operation Market Garden, the airborne 6pdrs of the Airlanding Anti-Tank Batteries proved critical in beating back German armoured counter attacks around Oosterbeek and at the bridge in Arnhem itself. They were instrumental in repulsing the SS reconnaissance battalion which attempted to cross the bridge on the second day of the battle.
One desperate action involving a section of two 6pdrs saw three StuG-III self-propelled guns knocked out before the crews of both guns were killed. The last survivor, Lance-Sergeant Baskeyfield managed to man on of the guns alone and destroy a fourth StuG-III before he was killed. For his actions he was awarded the Victoria Cross.
Like its predecessor the 6pdr was also used as a vehicle gun, mounted in the Churchill Mks III & IV, Valentine Mk IX and the Crusader Mk III tanks as well as the Canadian MkII Ram and the MkII AEC Armoured Car. These vehicles had previously been designed to mount the 2pdr, but were adapted to fit the new 6pdr, in some cases having to remove a crew member from the turret to make enough room to fit the new gun. The Cavalier, Cromwell and Centaur tanks were designed to mount the new larger gun from scratch.
The first tank, equipped with a 6pdr, to go into action was the Mk III Churchill, which took part in the disastrous Dieppe Raid in August 1942. The new tanks, assigned to the 14th Army Tank Regiment (The Calgary Regiment (Tank)), were all abandoned or destroyed during the raid.
In North Africa, like the 2pdr, the heavier guns were mounted on trucks as Portees. Additionally AEC produced the Mk1 Gun Carrier or Deacon self-propelled gun – a 6pdr mounted in an armoured turret on the back of an AEC Matador truck chassis. These performed well in the desert but more enclosed country made them vulnerable and they were removed from service after the North African campaign.
It was not only tanks the 6pdr found itself mounted in. Coupled with the Molins automatic loading system it was also mounted in the RAF’s De Havilland Mosquito Mark XVIII ‘Tstetse’ and the Royal Navy’s motor torpedo boats. The Navy’s Molins auto-loader allowed the gun to fire a 6-round burst at a rate of 1 round per second. Nearly 600 naval versions of the gun, the QF 6pdr MkIIA, were produced. The RAF’s use was more short-lived with only 17 6pdr Tstetses built before 3in rockets were standardised. Despite this two Tsetse of 248 Squadron sank the German submarine U-976 in March 1944.
The US also adopted the 6pdr to replace their 37mm M3 anti-tank gun. It had initially been planned to produce the 6pdr in the US under the lend-lease agreement (4,242 guns were eventually delivered for British use) but in May 1941 the US approved the production of the 6pdr as the 57mm M1 Gun. The US M1 guns had a longer barrel than their British counterparts and many smaller differences in manufacture. The US, like Britain, mounted the gun on vehicles such as the M3 half-track – the T48 Gun Motor Carriage. By the end of the war the US has produced over 15,600 M1 anti-tank guns.
Ordnance QF 75mm was developed from the 6pdr, the 75mm guns were manufacture by boring out the 6pdr’s barrel to enable it to fire the US 75mm M46 HE round. The QF 75mm was fitted to a number of British armoured vehicles from 1943 onwards.
The 6pdr was a simpler gun to manufacture than its predecessor but despite being effective throughout the war it too was surpassed by a heavier gun, the QF 17pdr AT gun, which was developed in the early 1940s, the 17pdr was accepted for service in May 1942 but the 6pdr remained in service alongside the heavier guns.
After the end of the war the 6pdr continued to see use with a number of countries including Israel during the 1950s, the Irish Army and South Korea during the Korean War. The 6pdr remained in British service until 1951, before being replaced entirely by the 17pdr.