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Official tests were also conducted to test the sound levels produced by the De Lisle. These tests recorded the De Lisle as having produced 85.5 dB of noise when fired, compared to the 156 to 168 dB given off by standard handguns chambered for the same cartridge. The De Lisle achieved these levels of quietness through its use of a subsonic cartridge as well as though its large integrated suppressor. The barrel fitted onto the De Lisle was ported (i.e. drilled with holes) to provide a controlled release of high pressure gas into the suppressor that surrounds it before the bullet leaves the barrel. The De Lisle's large suppressor (2 inches (5.1 cm) in diameter) went all the way from the back of the barrel to well beyond the muzzle, making up half the overall length of the weapon. The suppressor provided a very large volume to contain the gases produced by firing; this was one of the keys to its effectiveness. The De Lisle's quietness was found to be comparable to the Welrod pistol, another weapon of British design. However, the Welrod was useful only at very short ranges and used fabric and rubber components in the suppressor that required replacement after a few shots, while the De Lisle was able to fire hundreds of rounds before the suppressor required disassembly for cleaning.
 
Official tests were also conducted to test the sound levels produced by the De Lisle. These tests recorded the De Lisle as having produced 85.5 dB of noise when fired, compared to the 156 to 168 dB given off by standard handguns chambered for the same cartridge. The De Lisle achieved these levels of quietness through its use of a subsonic cartridge as well as though its large integrated suppressor. The barrel fitted onto the De Lisle was ported (i.e. drilled with holes) to provide a controlled release of high pressure gas into the suppressor that surrounds it before the bullet leaves the barrel. The De Lisle's large suppressor (2 inches (5.1 cm) in diameter) went all the way from the back of the barrel to well beyond the muzzle, making up half the overall length of the weapon. The suppressor provided a very large volume to contain the gases produced by firing; this was one of the keys to its effectiveness. The De Lisle's quietness was found to be comparable to the Welrod pistol, another weapon of British design. However, the Welrod was useful only at very short ranges and used fabric and rubber components in the suppressor that required replacement after a few shots, while the De Lisle was able to fire hundreds of rounds before the suppressor required disassembly for cleaning.
  
The De Lisle uses several components from a number of different firearms.<ref name = "de lisle forgotten weapons">[https://www.youtube.com/watch?v=YtzaVil5joc Forgotten Weapons video on the De Lisle carbine]</ref> The main body is based on the stock of a Short Magazine, Lee–Enfield Mk III*, converted to .45 ACP by modifying the receiver, shortening the bolt/bolt head, and replacing the barrel with a modified Thompson submachine gun barrel. It feeds from Colt M1911 magazines, modified so that they could be used with the Lee-Enfield's magazine release system. The primary feature of the De Lisle was its extremely large suppressor, which made it very quiet in action. So quiet, in fact, that working the bolt to chamber the next round makes a louder noise than actually firing a cartridge. The rifle's bolt-action operation offered an advantage during covert operations, in that the shooter could refrain from chambering the next round if absolute silence was required after firing. A semi-automatic weapon would not have offered this option as the cycling of the bolt coupled with rearward escaping propellant gas and the clink of the empty case against any hard surface would produce a noise with each shot.
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The De Lisle uses several components from a number of different firearms. The main body is based on the stock of a Short Magazine, Lee–Enfield Mk III*, converted to .45 ACP by modifying the receiver, shortening the bolt/bolt head, and replacing the barrel with a modified Thompson submachine gun barrel. It feeds from Colt M1911 magazines, modified so that they could be used with the Lee-Enfield's magazine release system. The primary feature of the De Lisle was its extremely large suppressor, which made it very quiet in action. So quiet, in fact, that working the bolt to chamber the next round makes a louder noise than actually firing a cartridge. The rifle's bolt-action operation offered an advantage during covert operations, in that the shooter could refrain from chambering the next round if absolute silence was required after firing. A semi-automatic weapon would not have offered this option as the cycling of the bolt coupled with rearward escaping propellant gas and the clink of the empty case against any hard surface would produce a noise with each shot.
  
 
Combined Operations requested a small production run of De Lisle carbines, and an initial batch of 17 were hand–made by Ford Dagenham, with Godfray De Lisle himself released from his Air Ministry duties so he could work full-time on the project. These initial production De Lisles were almost immediately pressed into service with the British Commandos. In 1944, the Sterling Armaments Company was given an order for 500 De Lisle carbines, but eventually only produced around 130. During the remainder of World War II, the De Lisle carbine was mainly used by the Commandos, although they also saw some use by the British Special Operations Executive (SOE). A number of De Lisles were shipped to the Far East and used during the Burma Campaign against the Japanese. The De Lisle would also be used during the Korean War and the Malayan Emergency, and it has been claimed that the weapon was also used by the Special Air Service during the Northern Irish Troubles.
 
Combined Operations requested a small production run of De Lisle carbines, and an initial batch of 17 were hand–made by Ford Dagenham, with Godfray De Lisle himself released from his Air Ministry duties so he could work full-time on the project. These initial production De Lisles were almost immediately pressed into service with the British Commandos. In 1944, the Sterling Armaments Company was given an order for 500 De Lisle carbines, but eventually only produced around 130. During the remainder of World War II, the De Lisle carbine was mainly used by the Commandos, although they also saw some use by the British Special Operations Executive (SOE). A number of De Lisles were shipped to the Far East and used during the Burma Campaign against the Japanese. The De Lisle would also be used during the Korean War and the Malayan Emergency, and it has been claimed that the weapon was also used by the Special Air Service during the Northern Irish Troubles.

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