The first shooting round knife pipe hard steel, cylindrical trunk in diameter by diameter of the round knife, height about 30 mm, the thickness of about 10 mm, when the tube is under the main mouth to match the beginning of the round knife; on the face of the shutter tube is attached to the hard steel sheet to do the title emperor for need TA's direction. Around the tube taken, should be drilled hole to 4 from 3 perforation holes diameter 5 mm to 6 mm, to escape the gas.
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