History
Ultra-Repulsor Ray Cannon was a weapon developed by Tony Stark for S.H.I.E.L.D. One of these cannons was mounted inside S.H.I.E.L.D.'s scientific complex called The Roost where Element X, the most unstable element on Earth, was stored. When the Grey Gargoyle attacked the base to obtain Element X, S.H.I.E.L.D. agents used the cannon against him but to no avail against his stone body.[1]