Lego semi-automatic shell ejection gun tutorial is as follows:

(1) First prepare the original Lego parts and rubber bands, a 15-hole flat beam, a large curved beam, and four black pins . Add a 24 gear to the four black pins to secure it. In addition, use long pins to fix two 13-hole flat beams in front of the finished beams. Use a long pin and a big-head pin to fix a 3-hole flat beam on the third hole of the flat beam. Also fix the long pin and big-head pin on the fifth hole on the other side. Place them on both sides of the 15-hole flat beam. Top the pin.

(2) Take a 9-hole flat beam with the holes facing upward, put it into the slot, and put a pin on the last hole. Put the rubber band on the pins on both sides, then put the rubber band on the pins on the 9-hole flat beam, and you have a small pistol. Pull the pin to shoot the gun, and the bullets can be made from paper balls.

: Lego bricks are a favorite toy for children. This kind of plastic building block has convex beads on one end and holes on the other end that can be inserted into the convex beads. There are more than 1,300 shapes, and each shape has 12 different colors, mainly red, yellow, blue, white, and green. It relies on children's hands and brains to create endless shapes, which is addictive and is called "magic plastic building blocks". The home of LEGO bricks is Billund, Denmark.

The inventor of Lego bricks is Ole Kirk Christiansen, who was born in 1891 in the village of Felsgov near Billund, Denmark. He has superb carpentry skills and was keen on making various small toys when he was young. The small airplanes, cars and animals that he made are all lifelike and lifelike.

Although he did not know how to do business and toys were often unsaleable, this did not make him give up his hobby. Later, the puzzle toy "Yue Yue" he designed finally became popular. In 1934, he designed the "LEGO" trademark for his building block toys.