By using precise aiming and heavy projectiles, the Siobhan can snipe many light to mid-weight targets with short bursts from its triple Gatling cannons, then slip away into the jungle for the next hunt. However, the XZ-279 is limited by its ammunition load. There is a variant in the works that replaces the self-contained projectile cannons with intensified lasers in an effort to extend field duty cycles, but energy and heat signatures could compromise the stealthy nature of the Siobahn.
CCS-3b-50 50mm Gatling Cannon (2) – Turret mounted, 350° horizontal arc, 200° vertical arc
One of the keys to the Siobhan’s operational efficiency is its turret mounted twin CCS-3b-50 self-contained Gatling cannon system. The pilot merely needs to mark his target’s signature and prowl about the landscape while the cannons track the target independently. They can be either triggered by the pilot, by the Siobhan, or be commanded to fire on opportunity. Also, they can fire anywhere from a single round or single burst of 30 rounds to a continuous 1,200 RPM rain of bullets that will cease when sensors indicate a kill. With a drum of only 600 rounds per gun some pilots disable tandem firing to extend ammunition. The CCS-3b-50 system, in short, allows the Siobhan to engage targets in any direction and deliver heavy to moderate damage at 2 kilometers.
CCS-6a-40 40mm Charged Projectile Gatling Cannon – Body mounted, forward arc, fixed
This cannon is larger by far than its turret mounted cousins, yet with a 20% smaller bore. On the other hand, it also carries a staggering 4,000 RPM rate of fire and a vertically mounted magazine holding 2,000 rounds of HAPEX (Hypervelocity Armor Piercing Explosive) rounds. The cannon is unique in that it has rounds with a vibro-penetrator core that is activated and charged as each leaves the chamber. This penetrator superheats to 9,000° by impact, melting through moderate armor like butter and passing through armored canopies without resistance. It also ensures that the round only explodes deep with the target rather than on the skin. This system has an effective range of 1.5 kilometers with quite good accuracy to 1 kilometer, achieving 80% of rounds within a 3-meter grouping.
LWS-15a-80 “Lewis” 80mm Laser Cannon – Head mounted, integrated, 60° forward arc
Early in its development it was clear that the Siobhan would have an energy based weapon to extend its ammunition and battlefield life. The "Lewis" (Laser Weapon System) 15a was developed as a backup weapon for this purpose. It is larger than it appears; the muzzle of the gun is seen in the mouth of the Siobhan but it is actually mounted within neck with further systems as far back as the torso. It fires a powerful pulse or a continuous beam, but the nature of the Siobhan as a hit and run unit usually requires the former. The LWS-15a-80 has the potential of extending the Siobhan’s effective range beyond 2 kilometers.
RCS-9a1 128mm Beam Bolt Cannon (2) – Chest mounted, fixed forward
Added to the newest generation of Siobhan (the XZ-279-C), this system is comprised of a pair of compact 128mm cannons that use a portion of discharge energy to accelerate the recharge and fire rate of the other gun. In short, it fires 20% faster than a single weapon, allowing it to compound the damage it delivers for short bursts. The heat the RCS-9a1 produces limits it to bursts up to 4 seconds with a lengthy cooling period between, but its effectiveness against targets up to 3 kilometers away and its lack of reliance on ammunition balances its shortcomings.
LBC-1A-35 35mm Linear Beam Cannon (3) – Tail & Torso mounted, integrated, 220° and fixed rear arc
Designed to pierce heavy armor with a sustained stream of condensed photons at ranges up to 5 kilometers, the LBC acts as both rearward sniper cannon and a close-in energy blade. The pilot can choose between the lasting blast to saw through more durable opponents or can cycle several shorter shots at one or more lightly armored foes. It was the original energy based carried by the Siobhan, intended to extend the ammunition of the CCS-3b-50 Gatlings. Two additional weapons were built under the chassis in the read arc in models using primerily projectile weapons, but these lack the blade feature innate in the tail cannon.
COL2b-150 “Twin-Fist” 150mm Canister Ordinance Launchers (8) – Shoulder mounted, 180° forward and lateral arcs
Designed primarily as an active defense system, the Twin Fist can also be loaded with offensive rounds. One unit is mounted atop each shoulder above the booster cowling affording a 180° lateral arc and one is mounted on the inside of the forward armor protrusion with a 180° vertical arc. Combined with shoulder actuation, all launchers actually have a much wider field of fire. Offensive canisters include CALM (Clustered Anti Light-armor Munition), “Broadshot” APR (Anti-Personnel Round), CISPR (“Crisper”; Close-In Sabot Penetrating Round), “Cinder” incendiary round, ReaPeR (Reactionary Plasma Round), and SSR (System-Shock Round). Ranges vary from 100 meters to 500 meters with effects suitable for targeting light armor, foot troops, or environment, with ReaPeR rounds deploying super-heated plasma that vaporizes soft components and melts armor on impact, and SSR rounds that effectively work like a Zoid-scale tazer, shorting out less insulated electronic systems on large Zoids and even a 25% of killing smaller units outright.
Saw-Pincer Alloy Fangs – head mounted, forward arc, integrated construction, 60° forward arc
The XZ-279 has a greatly improved bite over the DPZ-16 Gul Tiger; the maw is 50% longer with a 100% increase in aperture. The hardened alloy fangs are micro-serrated with manufactured diamond blades to pierce through armor at least as efficiently as the largest feline Zoids, but new bladed molars both crush and slice heavier armors to ribbons that often defy pierce-only bites.
Saw-Pincer Alloy Claws – Foot mounted, integrated construction, forward and lateral arcs
The Siobhan’s claws extend 25% farther than its Guylos counterpart, and their cutting efficiency has been doubled thanks to the same diamond-based micro-serration technology that benefits the fangs. These claws can draw into their housing allowing the Siobhan to “pad” more stealthily.