Why This ‘Embarrassing’ British Signal Pistol Was Secretly A Lethal Close Range Weapon
23rd of June 1942.
RAF Pembrey, South Wales.
A Luftwaffe Focke-Wulf 190, one of the most formidable German fighters of the war, touched down on British soil.
Not shot down, not crash landed.
The pilot, Oberleutnant Armin Faber, had become disoriented after combat over the Bristol Channel and mistaken Wales for France.
He landed perfectly, rolled to a stop, and began climbing out of his cockpit, expecting to be greeted by fellow Germans.
Instead, Sergeant Jeff, the duty pilot at this remote air gunnery school, came sprinting across the grass.
The base had no armed guards immediately available, no rifles within reach.
Jeff grabbed the only thing he could find in the dispersal hut, a 1-inch signal pistol, and jammed it into the German pilot’s face.
Faber surrendered.
The intact Focke-Wulf 190 became the first complete specimen captured by the Allies, yielding critical intelligence that shaped fighter development for the rest of the war.
And Jeff had done it with a flare gun, a weapon so embarrassing, so seemingly useless in combat that no training manual ever mentioned pointing it at another human being.
This is the story of the British Number One Mark 5 signal pistol.
A device designed purely for communication that soldiers repeatedly discovered could kill at close range.
Not because Britain planned it that way, not because anyone issued combat ammunition for it, but because desperate men with no other options learned what a burning pyrotechnic projectile does to human flesh at point blank range.
The signal pistol occupied an awkward position in military infantry.
Every army needed them.
Flares coordinated artillery, marked positions, called for support, signaled retreats and advances without radio communication.
Pyrotechnics were often the only way infantry could talk to artillery or aircraft.
Yet the device that launched these signals looked like a pistol, weighed like a pistol, and in the hands of a man about to be overrun, behaved like a pistol.
The British 1-inch signal pistol traced its lineage to the 1890s when the 26.5 mm flare cartridge entered service across European armies.
The name Very pistol, still commonly used, came from the American naval officer Edward Wilson Very, who patented an early design in 1877.
By 1911, the British Army had adopted the Mark III signal pistol, manufactured by Webley and Scott, Cogswell and Harrison, W. W. Greener, and other Birmingham gun makers.
These were brass instruments machined to tight tolerances fitted with walnut grips and proofed for the modest pressures of pyrotechnic cartridges.
The Mark III served through the First World War with minor modifications.
A flanged muzzle extension was added in 1916 to protect the operator’s hand during loading, creating the distinctive blunderbuss profile that would characterize British signal pistols for decades.
The brass construction was expensive and time-consuming, acceptable for peacetime production, but problematic when war demanded millions of small arms.
When rearmament began in the late 1930s, British ordnance planners faced a manufacturing bottleneck.
The skilled labor and precision machinery required for brass signal pistols competed directly with revolver and rifle production.
The solution was the Number One Mark 5, a wartime simplification that replaced machined brass with stamped sheet steel and zinc alloy and swapped walnut grips for black plastic.
Buridge Limited of Leicester was among the manufacturers with surviving examples dated to around 1942 bearing their markings.
The simplified construction allowed rapid production using semi-skilled labor and non-critical materials.
Exact production totals remain uncertain, though serial number ranges on surviving specimens suggest output in the tens of thousands.
The Mark 5 measured roughly 9 and 3/4 inches overall with a 5 1/2 inch smooth bore barrel.
A shorter variant, the Number Two Mark 5, was designed for armored fighting vehicles, measuring about 7 1/2 inches overall with a 3 and 1/2 inch barrel and featuring a mounting stud for through-armor brackets.
Weight for the steel and zinc construction fell somewhere between one and a half and two and a half pounds, though no authoritative figure has been officially published.
The mechanism was simple.
Break action, single shot, exposed hammer, center fire percussion ignition.
The barrel was proofed for the modest pressures of pyrotechnic cartridges far below the chamber pressures of conventional firearms.
Standard ammunition comprised color-coded signal cartridges, red, green, white, yellow, and blue, with cardboard bodies and brass bases.
Each cartridge featured tactile identification marks, knurled rims, and raised symbols, allowing soldiers to select the correct color in darkness by touch alone.
The question that haunted every soldier who carried one was obvious.
What happens if I fire this at a man?
The physics were brutal.
Pyrotechnic compositions ignite at around 191° C and burn at temperatures reaching 1,600°.
The compounds include magnesium, strontium nitrate, and potassium perchlorate.
These are not designed to wound.
They are designed to burn bright enough to be seen from miles away for long enough to convey a signal.
A burning flare embedded in human tissue does not simply wound.
It cooks.
A 2025 medical review published in Science Direct examined 31 documented flare gun injuries across published case reports.
92% required hospitalization.
Injuries included third-degree burns, skull fractures, airway destruction, vascular damage, and organ failure.
Two fatalities were recorded.
The study concluded that even civilian distress flares designed with safety margins cause catastrophic injuries at close range.
Military signal cartridges offered no such safety margins.
At contact distance, the 1-inch projectile had sufficient mass to penetrate the chest or abdomen.
Once embedded, the burning composition continued to burn.
The wound channel filled with molten metal and chemical fire.
Death was neither quick nor clean.
The gruesome potential was obvious to anyone who handled the weapon.
Soldiers knew what fire did to human bodies.
They could imagine without difficulty what a sustained burn inside the chest cavity would produce.
The signal pistol carried an implicit threat that exceeded its formal military purpose.
Every soldier who held one understood at some level that it could kill.
Yet for all this horrifying potential, the British military never developed the signal pistol as a weapon.
No training pamphlet mentioned defensive use.
No anti-personnel ammunition was ever manufactured.
No court martial records relating to signal pistol misuse appear in the national archives.
The device remained officially and doctrinally a communication tool.
The gap between what it could do and what anyone expected it to do remained unbridged throughout its service life.
The Germans took a different path entirely.
In 1942, Wehrmacht ordnance began converting the standard Leuchtpistole 34 flare gun into a combat weapon.
The resulting Kampfpistole received a rifled barrel and an entirely new family of ammunition.
The program produced high explosive grenades, fragmentation rounds, and even miniature anti-tank projectiles.
The later Sturmpistole variant could fire shaped charge rounds designed to penetrate armor.
The system came with a detachable shoulder stock, folding sights, and official doctrine for anti-personnel and anti-tank employment.
Germany invested substantial resources in manufacturing combat ammunition for these converted flare guns.
Training manuals were issued.
Doctrine was written.
The flare gun was meant to become a grenade launcher that every soldier could carry.
The concept made theoretical sense.
Infantry often needed explosive capability at short range.
Dedicated grenade launchers were heavy and complex.
Converting an existing signal pistol seemed efficient.
Germany was increasingly short of raw materials and manufacturing capacity.
Adapting a device already in widespread service appeared to solve multiple problems simultaneously.
The reality proved different.
The Kampfpistole suffered from fundamental limitations that no amount of engineering could overcome.
The short barrel and light frame produced severe recoil with combat ammunition.
Accuracy was poor even at modest distances.
The rounds themselves were small, limiting both explosive and armor penetrating capability.
Even the anti-tank variants struggled against late war armor, which had grown steadily thicker as the war progressed.
Troops reportedly preferred other weapons when available.
The Panzerfaust, despite being a single-use disposable weapon, offered far greater armor penetration and required no modification of existing equipment.
Standard rifle grenades launched from the Karabiner 98 provided explosive capability without the accuracy problems of the pistol format.
The Kampfpistole filled a niche that other weapons already occupied and filled it less effectively.
On paper, the Kampfpistole program represented a genuine attempt to give every German soldier a grenade launcher.
In practice, the weapon had limited effectiveness.
The British never pursued this path.
The reasons were structural and revealed something important about the difference between British and German military planning in the latter half of the war.
British infantry had adequate sidearms.
The Enfield Number Two .38 revolver was the standard issue pistol for officers and specialists.
A reliable weapon that remained in service from 1932 through to the 1960s.
Webley Mark V revolvers supplemented these and later the Browning High Power entered service, providing a modern semi-automatic option with 13 round magazine capacity.
British soldiers who needed a pistol had a proper pistol.
For short-range explosive capability, rifle launched grenades filled the niche.
The Number 68 anti-tank grenade could be fired from any Lee-Enfield rifle fitted with a cup discharger.
The Mills bomb, Britain’s standard fragmentation grenade, could also be rifle launched.
These systems provided genuine explosive and anti-armour capability without requiring soldiers to learn a new weapon or carry additional specialist ammunition.
Allied combined arms doctrine provided artillery and air support that Germany’s increasingly desperate infantry lacked.
A British platoon under pressure could call for mortar fire, artillery support, or air strikes through established communication channels.
The signal pistol itself was part of this system, coordinating these heavier weapons rather than attempting to replace them with a handheld grenade launcher.
And critically, repurposing signal pistols risked tactical confusion.
An operator reaching for a high explosive round in a signal pistol loaded with flares could produce catastrophic friendly fire incidents.
The signal pistol’s entire purpose was visual communication.
Loading it with combat ammunition undermined that function.
British ordnance planners understood that a device could not effectively serve two contradictory purposes.
The American M8 flare pistol followed a similar pattern.
Designed as a pyrotechnic launcher, it was occasionally used in desperation, but never systematically weaponized.
No Allied nation matched Germany’s commitment to the flare gun as combat weapon.
And Germany’s own experience proved the concept fundamentally flawed.
Yet soldiers used signal pistols in combat anyway.
Not because doctrine told them to, but because they had nothing else.
One of the best documented Commonwealth incidents came not in the Second World War, but in Korea.
On the night of November 2nd, 1951, Lieutenant Edward Mastinardi of the Second Battalion, Royal Canadian Regiment, commanded a 28-man platoon on Hill 187, an isolated outpost beyond United Nations lines.
According to the official Canadian Army history and his citation for the Military Cross, a Chinese battalion attacked the position that night.
Mastinardi fought for hours.
When his pistol ran dry after killing two attackers, he grabbed his signal pistol and fired a flare into a third Chinese soldier at point blank range.
The man died.
Mastinardi’s platoon held.
The Pembrey incident with Sergeant Jeff and the captured Focke-Wulf was intimidation rather than combat use.
According to Imperial War Museum records, Jeff never fired.
The German pilot surrendered to the threat alone.
The moment lasted seconds.
Faber, disoriented from combat and unaware he had landed in enemy territory, found himself staring down the barrel of what looked like a pistol.
He had no way of knowing it was a signal device.
He surrendered.
The intelligence value of that capture proved immense.
The Focke-Wulf 190 was the first intact specimen obtained by the Allies.
British and American engineers dismantled it, studied its airframe, analyzed its engine, and incorporated lessons into their own fighter development.
The capture shaped Allied aviation for the remainder of the war.
The episode reveals how soldiers thought about signal pistols when circumstances demanded improvisation.
Jeff did not hesitate to point it at a man because he understood at some level what it would do if fired.
The threat was real, even if the weapon was not designed for combat.
That gap between design intent and practical capability defined the signal pistol’s strange position in military history.
The signal pistol was never a practical combat weapon.
It was single-shot with no rapid follow-up capability.
The projectile velocity was poor, well under 100 m/s compared to 250 to 400 for conventional pistol ammunition.
The smooth bore barrel made accuracy beyond contact distance largely theoretical.
Lethality depended entirely on whether the flare embedded and ignited, an unpredictable variable that made the weapon unreliable even when it worked.
An Enfield Number Two revolver delivered approximately 134 ft-lb of reliable kinetic energy with six shots available.
A 9mm Parabellum delivered roughly 350 ft-lb.
The signal pistol offered nothing comparable.
Its only advantage was the horrifying nature of the wound it produced.
And that advantage required the shooter to be close enough that any conventional weapon would have been superior.
The British approach to the signal pistol reflected broader doctrinal clarity.
Communication devices served communication.
Combat devices served combat.
The 1-inch signal pistol was issued to nearly every vehicle, crew, aircraft, vessel, and headquarters unit in the British military.
Its role was coordination, not killing.
When soldiers like Mastinardi used it to kill, they did so because everything else had failed, not because anyone intended the weapon for that purpose.
The Number One Mark 5 signal pistol served its intended purpose brilliantly.
Reliable, simple, manufacturable in wartime conditions with non-critical materials, compatible with existing ammunition stocks, and effective at the communication tasks for which it was designed.
Signals called artillery onto targets.
Signals coordinated infantry advances.
Signals marked friendly positions for aircraft.
These functions saved more lives than any hypothetical combat application ever could.
When Sergeant Jeff pointed his signal pistol at Armin Faber in June 1942, he was holding a communication device.
When Lieutenant Mastinardi fired his into a Chinese soldier in November 1951, he was holding a communication device.
Neither man carried a secret weapon.
Both men carried standard military equipment used in ways its designers never intended.
Because combat reduces everything to the question of what you have in your hand when you need it most.
The Number One Mark 5 did exactly what Britain needed.
A communication device that worked.
The fact that it could kill at contact range was incidental.
The fact that it almost never did was evidence of proper planning.
On that June day in 1942, when Sergeant Jeff ran across the grass at RAF Pembrey with nothing but a signal pistol in his hand, he was not carrying Britain’s secret weapon.
He was carrying a tool for launching flares that happened to look threatening enough to make a German pilot surrender.
The Focke-Wulf 190 he captured that day provided intelligence worth more than any improvised combat use of a flare gun ever could.
British engineers learned how German designers had achieved such impressive performance from a radial engine fighter.
American engineers incorporated those lessons into their own development programs.
The capture influenced fighter design on both sides of the Atlantic for years afterward.
Jeff never fired.
He did not need to.
The signal pistol served its purpose not by killing, but by threatening.
The German pilot saw a weapon and surrendered.
What he actually faced was a communication device, a tool for coordination, a piece of equipment designed to launch colored lights into the sky so that distant observers could understand what was happening on the ground.
That is the true legacy of the British signal pistol.
Not a secret combat weapon, not a hidden capability that soldiers whispered about in trenches and tank turrets, just a reliable piece of equipment that did its actual job so well that its theoretical potential for violence almost never mattered.
The Number One Mark 5 launched flares.
It coordinated artillery.
It marked positions for aircraft.
It communicated across battlefields where radio was unreliable or unavailable.
And on the rare occasions when desperate men turned it against the enemy, it worked.
But those occasions were so rare, so exceptional, so far outside normal military experience that they proved the rule rather than breaking it.
The British Signal Pistol was not embarrassing because it could kill.
It was embarrassing because killing was never the point.
British engineering produced better weapons for that purpose.
The signal pistol did something else entirely and did it brilliantly.