There are 2 most prominent concept in WBB hopup. The first one is the older and more well known concept of rotating the gel by creating a different air pressure which is what ATK hopup are made off. They usually came with a small hole which displace the air as the gel passes through, creating the ma..
This Boslipo(also known as Tactical Version) lipo suitable for Lehui Vector or blaster with small battery compartment.Does not fit into M4A1 blaster type buffer tube. Please check battery measurement before purchasing.Battery measurement : 40.8mm(L) x 17.52mm(W) x 21.98mm(B)..