ASG SLV36 this gun is essentially a jg g-36 but is licensed with H&K trademarks (like most ASG guns) you can upgrade this with many parts including systema and Tm parts
the src version does have a gen3 gearbox but lacks the build quality and trade marks which give it its authentic feel also the src g-36 is 159£ (depending where you buy it) whereas the ASG version is 130£ at socom tactical and most other retailers