If you are looking for a compact AEG with simulated blowback and recoil features then getting the Tokyo Marui HK416C NGRS is no brainer. This is already available for some years now and it is a handy AEG for CQB. It uses the HK416 NEG magazine as well as the Marui M4 NEG magazines. Mach Sakai gets his hands on one for a quick video review.