G&G F2000 M4 hop-up conversion

Had sealing problems with the stock hop-up, couldn't get past 450 fps. Designed a new magazine block and spacer ring to work with a modified SHS pro-win style hop-up. Allso increased the size of the magazine tube, because had some feeding issues.

The supplied ring is a mock-up. You will probably need to increase the thickness for better feeding (went from a 2mm to 2.5mm)

On the hop-up chamber cut the lower tube, that goes into the magazine and round the corners.

This bumped my fps by 30