A question that should always be asked about the GBLS GDR15 DAS AEG given that it's a rather expensive AEG. Airsoft CamMan ask this question... "I’m back with the GBLS DAS GDR15, after a disastrous first use which saw the GDR15 jamming very often. The GDR15 has just been returned to me from warranty repairs where a micro switch was replaced. Said to be the most realistic and advanced AEG available on the market at present, I give the GBLS DAS GDR15 another run out."