It is not my intention
here to go into the fascinating history
of the Thompson sub-machine gun, suffice to say that
For the financial
backing came from Thomas Fortune Ryan, an Irishman who knew a good thing when
he saw it. He was also a funder of Clan na Gael and knew all about the Irish struggle back home and
how the hard pressed IRA needed all the weapons they could get.
General Thompson
himself travelled to Europe in May 1921 and trialled the new Thompson gun for the British Army on 30th
June at the Royal Small Arms factory at
The first customer
for the gun was the Irish Republican Army (IRA) and they paid cash for large numbers of guns.
Harry Boland,
senior IRA emissary who arrived in
When Governments,
police and military were doubtful of the Thompson gun, it was the Irish who
realized its value and worth.
The gun was designed by Colonel John Thompson in
1919. He originally wanted to design an automatic battle rifle but soon looked
at the idea of a small hand held machine
gun, which was revolutionary for its time.
General Thompson
at the time was well known in arms circles – he was Director of Small Arms
development for the US Ordnance dept.
He formed a
company called Auto-Ordnance Corporation with Ryan in December 1916. He was
later to bring his son Marcellus onto the board.
His idea was to
use the commonly available .45ACP round (Automatic Colt Pistol) which had been
used in the famous Colt 1911 automatic pistol. It was a heavy man stopper
round. The
He had the
description of “trench broom” in mind as
the war was still progressing.
His first
prototype was known as the “Persuader” which was ready just as World War 1 ended.
In design stage they used a webbing belt to feed the cartridges but the
mechanism would jam.
Next came the 20
round box magazine which progressed to the iconic 50 round and 100 round round drum.
The nest design
was known as the “Annihilator 1”
There was a debate
at this stage on what they should call the invention. General Thompson objected
to calling the piece a “machine gun” so the term “sub-machine gun” was adopted
to indicate that it was of a lower category than a rifle cartridge machine
gun.. The question however remained as to whose name the invention should take,
The General
proposed to name it “The Ryan Sub-Machine Gun” after their financial backer
Fortune Ryan but he did not agree and insisted that it be christened “The Thomspon Sub-Machine Gun” as he was the military man.
The prestigious
Colt Firearms Company was to manufacture the Thompson Gun. Colt saw that they
had and offered $1 for all rights. Ryan told Thompson to refuse. The production
deal was signed on August 18, 1920. Colt were contracted to manufacture 15000
units in the first year with 20 round box magazines which they did. The cost to
manufacture one unit was $44.56. Last minute changes to the design included
sights, butt stock and semi-automatic features. The first Colt Thompson came
off the line in April 1921 and was aptly called “Model of 1921” and bore these
words on the frame with four serial numbers (first 1000 units) on receiver left
hand side, under forearm of grip, the frame and on barrel chamber. The actuator
slot on top of frame is squared in early models and rounded in later. Later
serial numbers were dropped from barrel location.
The wooden butt
stocks were made by Remington as well as the barrel blanks. The Remington
trademark of an anchor is visible on the stocks. The drum magazines were
stamped by an outside house and assembled and blued by Colt. The rear sights
were made by Lyman Company.
The first Colt
production Model of 1921A had a rate of fire of 800 rounds a minute.
Magazines ranged
from the standard 20 round box known as
XX, to 30 round box known as XXX, 18 round (shot shell) box, Type L 50 round
drum and Type C 100 round drum.
The Model of 1921
Thompson weighed 10lbs 4ozs.
The stick magazine
weighed 2lbs loaded.
A 50 round drum
magazine (L denotation) weighed 2lbs 8ozs.
A 100 round drum
magazine (C denotation) weighed 3lbs 2 ozs.
Colt first
production model serial number 41 was shipped at end March 1921 and last of the
contract serial number 15040 manufactured in July 1922.
These first 15000
guns lasted Auto-Ordnance for almost 20 years.
By 1939, some 4750
Model of 1921 guns were still in storage. Auto-Ordnance had sold only 1500 to
the US Government, 4700 sold elsewhere in the
The logos used on
the Colt guns was of two distinct types – the early one was “Auto-Ordnance Co.”
in a bullet image on Model of 1919 prototypes made by Auto-Ordnance themselves
and then Model of 1921 guns made by Colt up to serial number 1000. After that,
the Thompson bullet image was used on the remaining 14000 guns and all guns
thereafter.
Interstingly, on 17th May 1921 a purchase of
two guns serial numbers 397 and 411 was made and recorded in the name of “Thos.
F. Ryan” – the financier behind Auto-Ordnance himself had succumbed to owning
the Thompson Gun.
Thomas Fortune
Ryan died in 1928 , Marcellus Thompson died in 1939 and General Thompson died
in 1940.