Since it was made around the same time as the Duel Blitz, I'm posting them consecutively!

Like the Duel, the Buster has been modernized and modified, featuring a nuclear engine.
The distinctive linked cannons are gone, and the mobile suit now stands out with its high-powered beam weapon, the "Dual-Barrel Multipurpose Cannon"!
Incidentally, the beam gun has been modified to be movable, allowing it to be reproduced without swapping parts.
Can you see it in the image above, on the right barrel...?

HGCE Lightning Buster | フロスト's Gunpla works