Rev 11:4-5 sounds like light sabers *LoL*
But John of Patmos is describing the 2 witnesses like they are high tech weapons being described, so it's some symbol but that which doesn't match Zech 4 because the 2 there are the 2 Messiahs not the witnesses.
and Zech 4:6 in the Tanakh version is non violent where Rev 11 is very violent.
Zech 4:6'Not by military force and not by physical strength, but by My spirit,' says the Lord of Hosts.
What would you say the stone is in Zech?
Temple Block Stones?
The symbols match perfectly. Both say: "These are the two olive trees and the two lampstands that stand before the Lord of the earth." Fire from their mouths consuming their enemies, like elijah calling down fire from the sky, is not about violence or high tech weapons as in 2 Esdras 13:5-11:
"I looked again and saw a crowd too large to count. They were people gathered together from all parts of the world to fight against the man who had come up out of the sea. Then I watched the man carve out a high mountain and fly up onto it. I tried to see the place or the region from which the mountain was carved, but I couldn't. Then I saw that all the people who had come together to make war against him were terrified, but they still prepared to fight him. When the man saw the great crowd advancing to attack him, he did not take up any weapons. The only thing I saw was what looked like a stream of fire coming out of his mouth. He sent a flaming wind from his lips and a storm of sparks from his tongue. The stream of fire, the flaming wind, and the great storm combined and swept down on the crowd that was coming to attack him, and burnt them all up. In a single moment, that crowd too large to count vanished, and there was nothing left but powdery ashes and the smell of smoke."
The capstone is symbolic of the second messiah which shows that the temple under construction in the vision is not about a man made building. Jesus compared himself to the foundation stone, the first messiah and whatever you believe or don't believe Jesus fully expected to return to fulfill the prophecies of a second messiah.
"I am the Alpha and the Omega, the first and the last."