Spending on a GBLS DAS GDR15 AEG is a serious one as it is perhaps the most expensive AEG in the market these days. If you encounter issues, it is best that you'll be able to troubleshoot yourself and BESTA Airsoft discuss the issues and solutions with this airsoft and training weapon... "The DAS System has been a great experience so far, but like every platform, it has its issues. Along the way, we found some fixes to some of the problems so the GDR 15 keeps on shooting."