That gas system, though
Behold, the Trimese-16:
The gun, literally one-upping the infamous Siamese-16*, has three barreled uppers with interlocking gas tubes. The gas system of each feeds into the next rifle and it only has one trigger, causing it to fire three shots with one pull of the trigger, in rapid order.
More in my column at Guns.com.

Cool idea, not very robust.
I loved Chimera, excellent work. It certainly outshines the general run.
Any plans to put the other two up on KU?