This is the HGUC Zequine's third-class armament (solid projectile weapon carrying type, fortress battle specification), which means it's equipped exactly as it is in the kit.
Since this is a rare Zequine 3D model, I took the opportunity to make various armaments myself. This kind of thing is a lot of fun, but the problem is that with just one main unit, you're limited in how much you can display it lol.
This is true for the Striker Pack and Wizard System, as well as the V2, G-Self, and G-Line...the best example would be the F90.
I haven't tweaked the movement, so posing is quite difficult...lol

RMS-141 Zekuein (third-class weapon) | 121kry's Gunpla works