Semi-automatic guns:
Semi automatic guns are the firearms which are automatically loaded after the first round is fired.
These type of guns have a special mechanism which operates on the energy released from the first shot. 
A semi-automatic pistol harnesses the energy of one shot to reload the chamber for the next, typically via recoil operation, blowback, or gas operation. After a round is fired, the spent casing is ejected and a new round from the magazine is loaded into the chamber, allowing another shot to be fired as soon as the trigger is again pulled.
Normally this semi-automatic pistols have synonyms like self-loading auto pistol, automatic pistol, auto-loading pistol, self acting pistol.
Evolution of semi-automatic pistols
After Hiram Maxim introduced his recoil-powered machine gun
 in 1883, several gunsmiths set out to apply the same principles to 
handguns, including Maxim. Maxim's designs for smaller firearms using 
his recoil-powered ideas never went into production. In the 1880s, other
 designers worked on self-loading designs. The first model to gain any 
commercial success was the Hugo Borchardt-designed C-93,
 designed in 1893 and made its public debut in 1894. Borchardt invented 
the C-93 mechanism, based in large part upon Maxim's toggle-lock 
principle.
 The C-93 featured a clever locking mechanism modeled after the human 
knee joint. in which the mechanical joint is called a knee, or in German
 Kniegelenk (knee joint). ( * Wikipedia source)
The evolution of pistols can be shown from the period 1880 to present ...
The order of the semi-automatic pistols is shown below-
- Borchardt C-93 pistol (1883)
- Nagant M1895 (1891) soviet
- Mauser C96 (1896)
- FN Browning M1900 (1896)
- M1911 (1911)
- TT-30 (1914) world war -1 - soviet union
- Browning hi-power pistol (1922)
- Walther P38 (1938) nazi- germany
- Smith & wesson model 39
















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