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Reviewed by Jason Chen

The HK MP5-SD6 is an excellent balance between performance and appearance. Easily one of the most structurally sound AEGs I've seen, the SD6's rubberized foregrip gives absolutely no creaking sounds. The only parts of the gun that generate sound when it is shaken are the metal magazines [which seem to have just a millimeter or two of clearance from the magazine catch] and the metal rails of the retractable stock [when fully extended]. It's very light for its size, mostly composed of ABS plastic, but with a battery and a fully loaded magazine it gets to be a burden after a tough hour or two of gaming. Being used to holding long, heavy air rifles and unaccustomed to the small [roughly 20 inches with stock extended] size of the MP5-SD6, I do find it kind of hard to keep the gun up and in front of me because of the angle of my arms, but that comes with time and is a personal problem. Surprisingly, the ABS resin used to manufacture the upper receiver of the gun has a texture VERY similar to real metal and almost appears like it at first glance. As with all of the MP5s, the receiver is extremely detailed, even with 'weld' markings prominently featured in plastic.

The lower receiver, however, is a bit iffy for me, as the plastic feels a bit too 'smooth' [though I'm sure this is not Tokyo Marui's fault] for me to get a good grip on and it constantly feels like my hands are sweaty and the grip slips from my hand. Gloves, however, remedy this problem very effectively. The battery is concealed in the large, cylindrical rubber foregrip which will hold either an 8.4 volt Mini battery or a special 'SD6' battery [which I know nothing of, unfortunately]. A single mini battery will last you practically forever, contrary to my first thoughts, but it's always handy to have another battery around. The foregrip is held in place with two small guard posts, which will pop out with little effort [make sure not to lose these!] and then the foregrip will slide forward on a rail. The battery is tucked into the space, the grip and posts are replaced, and you're back in action. This is an extremely easy motion, and my best time to complete it is 12 seconds, although it was under no stress and sitting in my room. The SD6's most prominent feature is the fake silencer unit that attaches [or detaches] to the muzzle with a quarter twist. It's basically just a plastic cylinder with holes and offers no silencing effect; I've filled it up with insulation foam, but that doesn't seem to help either. The silencer adds a very cool look to the gun, but functionally it's really not that much, although it does protect your gun's barrel a good deal; there's about 3 or 4 inches of silencer until you hit the brass inner barrel. Somehow, I look to see if it'll keep my barrel from gathering ice in the winter. Performance-wise, the SD6 does all that's expected of an AEG. Its overall combat performance is around equal to the MP5A5, firing around 286 feet per second.