Turkana warriors patrol with guns to protect their cattle from Nyangatom warriors in Ilemi Triangle, Kenya, July 14, 2019. REUTERS/Goran Tomasevic

An ammunition box is seen in an armoury in Misrata, Libya June 18, 2019. Picture taken June 18, 2019. REUTERS/Ulf Laessing

A heavy machine gun on the Iraqi side of the border with Syria at al-Qaim, Iraq, November 25, 2018. Picture taken November 25, 2018. REUTERS/Alaa al-Marjani

Visitors view the exhibits in the armoury section of the Chhatrapati Shivaji Maharaj Vastu Sangrahalaya museum in Mumbai, India, November 6, 2018. REUTERS/Francis Mascarenhas

A Belarusian hunter charges his gun as he takes part in a hunting on wild ungulates near the village of Myshanka, Belarus October 6, 2018. Picture taken October 6, 2018. REUTERS/Vasily Fedosenko

Prime Minister of Spain, Pedro Sanchez and his wife Maria Begona Gomez Fernandez, and the Prime Minister of Canada, Justin Trudeau, take part in a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Canada Justin Trudeau waits for the Prime Minister of Spain Pedro Sanchez before a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Spain, Pedro Sanchez, and the Prime Minister of Canada, Justin Trudeau, take part in a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Spain, Pedro Sanchez, and the Prime Minister of Canada, Justin Trudeau, take part in a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Spain, Pedro Sanchez, and the Prime Minister of Canada, Justin Trudeau, take part in a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Spain, Pedro Sanchez and his wife Maria Begona Gomez Fernandez, and the Prime Minister of Canada, Justin Trudeau, take part in a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Spain, Pedro Sanchez signs a ceremonial book alongside his wife Maria Begona Gomez Fernandez, and Prime Minister of Canada, Justin Trudeau, during a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Canada, Justin Trudeau, walks with the Prime Minister of Spain, Pedro Sanchez, during a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Spain, Pedro Sanchez, and the Prime Minister of Canada, Justin Trudeau, take part in a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Spain, Pedro Sanchez, and the Prime Minister of Canada, Justin Trudeau, take part in a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Canada Justin Trudeau waits for the Prime Minister of Spain Pedro Sanchez before a military welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Canada, Justin Trudeau, and the Prime Minister of Spain, Pedro Sanchez and his wife Maria Begona Gomez Fernandez, arrive for a welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Canada, Justin Trudeau, and the Prime Minister of Spain, Pedro Sanchez and his wife Maria Begona Gomez Fernandez, arrive for a welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Canada, Justin Trudeau, greets the Prime Minister of Spain, Pedro Sanchez, and wife Maria Begona Gomez Fernandez, as they arrive for a welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

Prime Minister of Canada, Justin Trudeau, greets the Prime Minister of Spain, Pedro Sanchez, as he arrives for a welcoming ceremony at The Royal Canadian Hussars Armoury in Montreal, Quebec, Canada September 23, 2018. REUTERS/Dario Ayala

A forensic technician carries a bag with bullet shells recovered from a crime scene where unknown assailants gunned down 4 police officers, according to local media, in the municipality of Tonala, in the Guadalajara metropolitan area, Mexico September 3, 2018. REUTERS/Fernando Carranza

Guns and gun replicas are laid on the ground before a child soldiers' release ceremony, outside Yambio, in South Sudan, August 7, 2018. REUTERS/Andreea Campeanu

A Mexican state police officer holds a Beretta 9mm pistol at the police barracks in Monterrey, Mexico March 24, 2018. REUTERS/Daniel Becerril

Beretta 9mm pistols are pictured at the police barracks storehouse in Monterrey, Mexico March 24, 2018. REUTERS/Daniel Becerril

Mexican state police officer holds a Beretta ARX160 rifle at the police barracks in Monterrey, Mexico March 24, 2018. REUTERS/Daniel Becerril

Mexican state police hold Beretta ARX160 rifles as they stand in formation at the police barracks in Monterrey, Mexico March 24, 2018. REUTERS/Daniel Becerril

Tourists look at Napoleonic-era French muskets, pistols and swords at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

Tourists look at 18th century small brass cannons on iron-shod carriages at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

18th century flintlock pistols are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

An 18th century air-gun is displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

Spanish 16th century cavalry carbines are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

Various artillery pieces dating to the 17th and 18th centuries are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

European flintlock sporting guns dating back to the 17th and 18th centuries, are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

18th century small brass cannons on iron-shod carriages are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

18th century French flintlock muskets are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

17th century early socket bayonets are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

17th century steel breech-loading rampart cannons are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

A rare 16th century German sword-gun, consisting of a short sword incorporating an in-built wheel-lock pistol, is displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

The gunstock of a 16th century heavy-barrelled wheel-lock arquebus is seen at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

The carved stocks of a pair of 17th century French flintlock holster pistols are seen at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

A tourist looks at European flintlock sporting guns dating back to the 17th and 18th centuries, at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

16th century musketeers' triangular powder flasks are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

18th century French flintlock muskets are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

17th century brass mortars are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

The match cord on a 16th century matchlock musket is seen at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

18th century flintlock-operated rocket launchers, believed to be Spanish in origin, are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

The firing mechanism of a 17th century flintlock gun is seen at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

16th century musketeers' horn powder flasks are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

17th century steel breech-loading rampart cannons are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

A 17th century leather gun is displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

The breech-piece of a 16th century built-up wrought-iron cannon known as a port-piece is displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

17th century steel breech-loading rampart cannons are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

A tourist photographs a rare 16th century German sword-gun, consisting of a short sword incorporating an in-built wheel-lock pistol, at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

The barrels of 16th century Ottoman Turkish muskets, known as Tufeks, are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

A rare 16th century German sword-gun, consisting of a short sword incorporating an in-built wheel-lock pistol, is displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

18th century French flintlock muskets are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

A 16th century Ottoman Turkish musket, known as a Tufek, and pistol are displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

A tourist looks at European flintlock sporting guns dating back to the 17th and 18th centuries, at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

A rare 16th century German sword-gun, consisting of a short sword incorporating an in-built wheel-lock pistol, is displayed at the Palace Armoury in Valletta, Malta, March 23, 2018. REUTERS/Darrin Zammit Lupi

Empty bullet cartridges are pictured at a shooting range in in Istanbul, Turkey, March 22, 2018. REUTERS/Osman Orsal