A concept I had for a cross between an Eastern Glaive and what I'd call a 'High-Velocity Impact Rifle' with an ACOG pointer scope for semi-accuracy and asingle-layer side-cache for reloads, both slim and noninvasive to the blade's manoeuverability.

Below is a lot of technical TL: DR for those who're interested in how the Sharkfin would work. Don't feel forced to read it if you don't want to.

This was an idea for a weapon used by Danny, since it would take someone strong to wield it, and yet someone with little enough body mass to wield it properly. He could also technically use his nanotechnology to charge and propel the projectiles at railgun-velocity for a more effective and shredding result, but that was a concept I'd included to any ranged weaponry I'd intended Danny to use. Doing it this way just seemed to eliminate the need for him to sacrifice a hand to hold a gun, and in my eyes, could lead to an interesting combination of attacks.

The rounds wouldn't be explosive, the weapon's overkill enough, and if he's gonna be close-range enough to attack using the blade, the last thing he'd want is an explosion, should he choose to use the rifle in any instantaneous situation. The acog and cache are both curved according to the contours of the blade, to be sure nothing catches on them and tears them off.

The bladed section of the weapon is completely conductive to correspond with Danny's nanotechnology, and the inside of the loader barrel is lined with solid-state diamond-bonded Nichrome, which is known for its ability to withstand high temperatures, and is a less conductive alloy than most others. This is then surrounded by rubber to completely isolate the rifle from the blade, in terms of conductivity. This allows Danny to flawlessly manipulate whatever part of the weapon he requires, and quickly/seamlessly, which is vital in combat situations.

When firing the rifle, it'd most likely be mounted on his shoulder from the rounded cushions just behind the handle. At the tip of the barrel is a recoil dampener, which slides inside the barrel, where slight suspension will deal with a good amount of the kickback. Of course, what the dampener can't compensate for, the shoulder brace and sheer body stature can take. The weapon needs a short time to load each shot, so the rifle would not be able to operate automatically.

The Sharkfin would overall be quite heavy since the entirety of it is used for warfare and needs to be robust enough to withstand the constant use of both its attributes. It would only be recommended for use by genetically enhanced individuals as on their own it is as much use to a basic infantryman as a high-power rifle, and as much use to a melee grunt as an axe; neither would be expected to wield both of the Sharkfin's capabilities effectively enough.