This is one difficult bash/replacement kit to obtain! A stubborn blockhead of mine, insisting on having 1/100 scale, Mobile Suit Gundam, Earth Federation Mass Production Mobile suit, visor type. The 1/100 Scale RX-77D Guncannon Mass Production Type Replacement Kit was produced by B-Club, so scarcely, way back in 2004 and I'm not sure if there is any recast done by E2046.
The replacement kit is manned for Master Grade MG Gun Cannon RX-77-2 (from the Earth Federation's Project V). The resin kits require more effort rather than the standard "right-out-of-the-box" MG kits. I got mine preowned and the it seems like an abandoned project even though the item was assembled and partially painted. I would say the initial state was pretty messed up and I had to spend a few days repairing it. Mainly to cement the respray parts, some hand painting and finally applying the anime alike looking decals on shoulders.
It's a shame, I didn't put my best effort, also no excuses on my amateur skills that the final result was less than desirable. Due to its rarity, I decided to still proceed with blogging of this kit and I apologised for the poor workmanship.
The replacement parts are kind of filmsy and didn't fit very well to the main kit. Similar to the RX-77-2 Guncannon, the Guncannon Mass Production Type mounts over each shoulder, a mid-range fire support artillery cannon. The kit comes with optional parts for an extension to 240mm Cannon and it has a gimmick of shortening those cannons and flipping them to the backpack in standby mode. The Guncannon Mass Production Type didn't have beam weapon in its arsenal so the supposedly beam rifle had been replaced with a 90mm bullpup sub-machine gun, similarly to those used by GM Type-C. The RX-77D.
Guncannon Mass Production Type is a less expensive variant of the original RX-77-2 Guncannon. This mobile suit made its debut in the anime 'Mobile Suit Gundam 0080: War in the Pocket' with two units were assigned to the Scarlet Team stationed aboard the Pegasus-class assault carrier LMSD-76 Grey Phantom. As predicted, the cannon fodders were easy targets to the Kämpfer and were wasted shortly after deployed.