Creative Speculation

... and that certainly qualifies, but what I would expect to happen if molten concrete flowed like lava around steel guns would be unrecognizable lumps of steel, not a lump that's still shaped like a gun in one case, and in the other two cases, concrete cooled in the shape of the guns before the steel melted and disappeared.

Again, if there's just the one photo, we're not going to resolve anything at all. And again, it seems strange that there hasn't been any follow-up from "truthers" if they think the photo is important evidence.