HOW TO INCREASE THE AIR-SEALED ON KWA-AR GBBR

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The bolt part : 
Slightly increase the depth of nozzle into the rubber to increase the air sealed.

1. Slightly polished flat (both side), parallel to the putter.
​(red circle in the pic)

2. ​Increase the depth above the putter.

3. After polished like the photo.

4. The measurement depth is about 3mm.

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The barrel extension part :
Increase the smoothness of the putter when loading BB.

1. Use fine sandpaper to polish smooth. (Red arrows in the pic)

2. ​Use fine sandpaper to polish smooth. (both side)

4. Assemble all parts, done!!