Modify Accurate Hop-Up M4/M16 AEG

New hop-up design by Modify for M4/M16 AEG
Features o-rings for enhanced air seal and tightness
Redesigned pressure plate by adding an adjustment gear making accurate adjustment easier.
Assembly Guide (PDF)
See diagram below for more info and pics
Please note the bottom o-ring is no longer included, some brands of mags will will not seat properly with that o-ring installed which causes jamming.