Air defence is a helpful role; many striders are no good at it.
This one is.
About this creation
The Zenith class: the ultimate light strike strider unit. Like most Zenexabas striders, it is vulnerable to air attack. Like many vehicles, there are many variants of the basic chassis floating around, many nothing more than unsupported upgrades by individual pilots. Some variants, however, are good enough to be made official. The Zenith C DAVID- whoops, DIVAD, is one such type.
Unlike many Zenith subtypes, the C is capable of carrying infantry; only special ones in light power armour such as these, however, as heavier suits break the handles and un-augumented soldiers tend to let go after a while, which is not a good thing while riding a 30-foot tall war machine that's moving at a good clip.
Like all Zeniths, the C fits a pilot. It also accomodates a larger and more effective sensor system than the base type, allowing it to take on electronic warfare jobs as well as its primary occupation of downing enemy aerodynes.
On a different note, the Zenith C is also very, very effective VS infantry and light vehicles. Zenexabas Marines, as shown here, are equipped with light power armour and are the usual choices for strider support.
The C is a DIVAD, that is to say, a DIVisional Air Defence unit. Its two twin 25mm autocannon arrays are more than capable of tearing down any aircraft stupid enough to approach. They usually fire flechette ammunition for this purpose, but many pilots have every other round be AP for anti-armour roles.
On yet another note, you should never fire one of these in such a way without an exoskeleton: the type has no butt/shoulder stock, and the recoil is a pig anyway. Regardless, firing it like this sans exoskeleton would break your wrist and smack you in the gut anyhow.
No offence is intended to you fanatic Star-Wars fans by the use of your precious Arr-Too-Dee-Toos as ammo bins. Helical magazines are high capacity and don't jam often when properly maintained, and for those reasons they are very helpful for weapons such as these which are very hard to reload.
I believe this image adequately shows the size of the machine.
Quoting Willis, the Legomancer
slots. missile variant nicknamed the R2-D2 missile
Slots? More like ammunition bins.
The arrtoos are being used as a helical magazine. Check wikipedia for 'Calico Liberty' if you want to know what that is.
Missile subtype? No, autocannons cannot be jammed or spoofed. Far more useful in an era of widespread electronic warfare.