GBLS - GDR15 / 416 M100 Main BCG Spring
GBLS DAS GDR 15 upgrade or downgrade spring purchased from GBLS will be used/installed at the owner’s discretion. Actual performance results depend on the quality of installation,
Airsoft AEG types inner barrel length, tightness of the air nozzle seal, and other possible performance-affecting factors. We are not responsible for any damage that may occur with improper installation. For best results, please do all upgrades at a certified professional Airsoft technician or GBLS .