Follow the instructions carefully and it's an easy upgrade. The 5 T8 screws on the back of the control panel have been removed. Remove the back cover. 2 screws removed from the trigger. 2 copper plate screws back into trigger. 2 HK switches are inserted into the new substrate. Failure due to a hard trigger pull will cause the trigger to stick, but simply reset the HK switch and get back to work. You need to retrain the trigger finger. I also bought a cheaper version with all the plastic parts that lasted 5 months before breaking. ***** Bonus you get a second set of springs, washers, copper plates ** for upgrading parts of the javelin Installed December 2019 and played many times through April 2020. I'm having an issue with triggers getting stuck and manually using the motion switches on the back of the control panel need to be reset.
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