I'll start with introducing the original unit's background.
Production Code: RGM-79FP
Call Name: GM Striker
Height: 18.0 meters
Armament: beam saber, 2 vulcan gun, 100mm machine gun, twin beam spear, spike shield
Designer: Hajime Katoki
Appearance: Gundam Senjou no Kizuna (Arcade/PSP), Gundam Target in Sight/Gundam Crossfire (PS3)
Timeline: UC 0079
RGM-79FP GM Striker was an original unit made from the collaboration project of Bandai Namco Games, Bandai, Sunrise, and Banpresto, name "Harmony of Gundam". I don't know much of the project other than that the units were all MSV, all units were designed by Hajime Katoki, and there's only 3 unit that managed to get their plamo adaptation (HGUC Zaku I Sniper, HGUC GM Striker, and HGUC GP02A MLRS/Beam Bazooka type).
GM Striker appeared on Gundam Senjou no Kizuna which is for Arcade and later ported to PSP, Gundam Target in Sight/Gundam Crossfire on the PS3, and SD Gundam G Generation Spirits & Wars on PS2.
You can say that GM Striker is Earth Federation's answer to Zeon's Gouf, which means it's an ace close combat unit. While it's long range weapon is only a 100mm machine gun (standard Ground GM and Ground Gundam machine gun), It's close range weapons consist of a single Beam Saber stored on the right shoulder, a Spike Shield where the spicke act similar to Alt Eisen's Revolver Bunker, and it's unique Twin Beam Spear. The GM Striker is also heavily armored to endure light weapons.
If you noticed, there is some difference between the 2D artwork and the 3D model. The HGUC kit follows the 3D model more closely, but even then there are some minor difference.
The WIP is coming up soon!