The latest gas blowback rifle in the market today made by the Star Rainbow Company (SRC). The SRC AKS74U  GBB is now available at Gunner Airsoft for US$259.00... "SRC released their GBB AK series Nov 2010, the first product is the AKS-74U. The gas system has the same concept as TM or KSC S7 system, it`s Much more stable than GHK AK gas system (which just uses a steel ball as a valve inside the nozzle). The gun will stop after the last round, (Unlike the GHK, which can still shoot empty shots). Chrono`d at 130m/s with Top Gas at 22 degree C."