1. Take out the 30ml aluminum tube PUR hot melt adhesive, pull open the tail pull ring, remove the desiccant, and use a sharp tool to poke several holes in the tail extrusion plug (PUR adhesive with good sealing does not need to be punctured). The front thread of the adhesive also needs to be punctured with a sharp tool before the adhesive can come out, as shown in the example below.

2. Then fasten the piston back cover, lift the back cover onto the PUR adhesive, rotate it 90 degrees, fasten the back cover, and place the adhesive into the gun body.

3. Then, cover the yellow metal back cover of the gun body, insert the pin, tighten the two black screws, and wait for about 8 minutes to heat up before gluing.