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This service include all the the following tasks done in our workshop.
- Drilling a new hole for the new HPA fitting
- Threading of the new hole
- Installation of the HPA fitting (EU or US version) with sealing product
- Modification of the original GBB magazine base plate
- Cleaning the inside of the magazine
- Seal and working tests
- Price include fitting & work fees, this mod cannot be purchased separately from a magazine
