The Dragunov is a semi-automatic, gas-operated rifle with a short-stroke gas-piston system. The barrel breech is locked through a rotating bolt (left rotation) and uses three locking lugs to engage corresponding locking recesses in the barrel extension. The rifle has a manual, two-position gas regulator. A gas regulator meters the portion of the combustion gases fed into the action in order to cycle the weapon and sets the recoil velocity of the gas-piston system. The gas regulator can be set with the help of the rim of a cartridge. The normal position #1 leaves a gas escape port opened in the form of a hole that lets some combustion gas escape during cycling. Position #2 closes the gas escape port and directs extra combustion gas to the piston increasing the recoil velocity of the gas-piston system and felt recoil. It is used for when the rifle does not reliably cycle due to carbon fouling build-up in the gas port, when shooting in extreme cold or high altitude or using low-powered ammunition.
Travel and Tourism.
A lot of people travel nowadays. But why do people travel? It's not surprising because distances between countries are becoming shorter due to the development of transport. Today people have lots of good reasons to travel. First of all, travelling is a part of people's education. It goes without saying that it's always interesting to discover new places and new ways of life, to try foreigh food and to listen to unusual music. Besides, travelling is a good way to practise foreigh languages. Another reason why people travel is to relax. And finally, a lot of people travel around the world on business.
There are a lot of diffent means of travelling. For example, when people have to visit another country, they prefer air travel because it's the fastest means of transport. Also, people like travelling by train. Nowadays modern trains are very comfortable.And a lot people prefer travelling by car because it's really convenient, you can stop any time you fell tired.
What are the most popular tourist distinations? The most popular tourist distination in summer is of course seaside because in summer people prefer to relax, they like swimming and getting a nice tan. But if people travel in winter, I think they like skating and skiing.
In recent years tourism has really taken off and today it is the world's second largest industry. Millions of people all over the world are fond of travelling.