This question comes in once a month, like clock work:
"I had these soldiers that were 3 3/4" and secured to a base, they made clicking sounds to simulate gunfire"
They are Mattel's Heroes in Action line, a neat little line of 3 3/4" soldiers that seems to have sold much better in Europe than here. I pictured the SWAT set up there for variety but the majority of the line was military themed.
I think the concept and execution were solid but it may have been too soon after Viet Nam for these things to be popular.