Resident Evil/Biohazard fans who want a licensed trades on their airsoft guns can check this Helios Umbrella Corporation Weapons Research Group Licensed M4 M-LOK AEG that's in stock at Evike.com. There are rifle, carbine, and SBR versions... "The Umbrella Corporation Weapons Research Group has been making expertly crafted weapons and weapons accessories since 2007. The design philosophy behind Umbrella Corporation is to offer practical, functional, and well thought out weapons systems that far exceed the expectations of the consumer to provide a definitive advantage.

The Helios Umbrella Corporation WRG M4 faithfully recreates the details of the real rifle. This AEG features high-detail Umbrella Corporation trademarks stamped deep on both side of the receiver, giving it an authentic appearance. The rifle features a light weight, ultra-slim machined aluminum MLOK free-float handguard, prefect for mounting all kinds of MLOK accessories. On top of the rifle you'll find a full-length 20mm Picatinny rail for optics as well as a set of folding front and rear iron sights. The functional bolt stop holds the mock bolt open to give easy access to the hopup adjustment dial.

Internally the Helios Umbrella Corporation M4 features a Tokyo Marui compatible Ver2 metal gearbox featuring heat treated reinforced high speed steel gears (13:1), 8mm steel bearings, full steel toothed piston, and high compression piston head & cylinder. The gearbox was meant to be incredibly high performance right out of the box, while at the same time offering an excellent platform for further tuning and specialty builds.

The Helios Umbrella Corporation M4 borrows a unique feature from CYMA that is the Quick Buffer System (QBS) which allows for rapid spring changes that can be done by hand. This efficient new system only requires the removal of your buffer tube castle nut to gain access to the captured guide rod and spring. No longer is it necessary to break open your receiver or even remove your stock from the buffer tube to change a spring."