Khan Seb, the French Airsoft Dude, takes the GBLS DAS M4A1 AEG for a range test to see how far it goes. We don't know if this the first version or the second version which is now in production... "Here is the DAS M4A1 from GBLS, a south Korean airsoft brand. The DAS M4A1 is, strictly speaking, an AEG, but it works with an actual bolt carrier which really makes it feel like a GBBR.