Tippmann Arms M4 CO2/HPA Rifle V2

 Unlike other HPA drop in engines the Tippmann M4, since it was developed purely as a gas powered RIF has a nice blowback which you can clearly notice on the video. Shooting it in full automatic mode makes you appreciate that blowback really well and the ROF that Gordon set this at gives it a very realistic feel. But the thing that I enjoyed more is shooting this in semi automatic. The trigger sets really quick and you don't get that lag feeling with an AEG. Basically this rifle will fire in semi auto as quick as your finger can pull that trigger. 

https://youtu.be/WHGz1w3AZE4