I was gonna mention this.
Reminds me of... well can't find any pictures. Some company mounted on AR on top of another, inverted, held together by the picatiny rails. The gas tubes from each cross to run the action of the other, and the gun on the top was modified to fire as soon as the bolt closed. The one on the bottom was select fire. A single trigger pull in semi-auto resulted in both guns firing one shot. I'm sure if I googled a bit longer I could find it... crazy.
H.






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