Next up is a comprehensive review by REAPERs Airsoft is the VFC/Umarex HK416A5 Gen Gas Blowback Rifle. The Heckler & Koch HK416 A5 is a popular airsoft gun as airsoft players trust the H&K brand and the various options that this GBB can be customised. It has powerful gas operation and a noticeable blowback for an uncompromising gaming experience. The full metal construction, blowback, NPAS system, and adjustable shoot-up make this model stand out. Generation 3 improves reliability, system stability, and ease of use by adapting the GuideHOP, firing pin and hammer system, and lower receiver.