Parody of/based on Katoki Hajime’s famous 1988 Ex-S Gundam two page spread watercolor in Gundam Wars III. Said image isn’t currently uploaded to Danbooru.
Retagging beam_smart_rifle because that’s the specific type of gun the Ex-S Gundam (and Zeta Plus) uses. The technology doesn’t appear in the Gundam universe outside of Gundam Sentinel.