I’ve decided to add mechs into my world to act as a force multiplication unit as well as an anti-[zombie] horde asset. Yes, I know that mechs are unrealistic and impractical at best but I just want to add a cool-factor into my world.

Anyway, the mechs (known as the **Mechanized Combat Platform**/MCP) in my world are about 15 meters in height and have enough room to fit in six people (the Unit Commander, Gunner, Assistant Gunner, two Mechanics, and Pilot). The Mechanized Combat Platforms have the following as their (current) armament:

* Some type of heavy gun that can cause serious damage to tanks and other armored vehicles as well as enemy infantry in a direct-fire role (still searching)
* Two M242 Bushmaster autocannons
* GAU-12 Equalizer rotary autocannon
* Two Mk 19 automatic grenade launchers
* Two twin-barrel M2 Browning Machine Guns (for crew use against hostile combatants and zombies)

I’ve thought about about including some type artillery gun and putting it on the MCP’s back kind of like what Pacific Rim did with [Coyote Tango](https://images.app.goo.gl/sryYtYkyZKktvQkV8) (except with just one howitzer instead of two). I was thinking of using either the [M777 howitzer](https://images.app.goo.gl/rpHjshJm7MH3pNVh9)  or [M119 howitzer](https://images.app.goo.gl/QMa5Ef7um7sV5H269) as the “backpack howitzer” but I’ve also thought about using a mortar instead. Regardless of what I choose, the howitzer or mortar will operate on a sliding rail system where the gun can move up and down the MCP’s back to provide either indirect or direct fire support.

But in general, would it be a good idea to include an artillery gun onto the back of the MCP? How effective would this be?