Article is almost a year old, but contains a lot of interesting details.

Top nuclear expert was killed by the Mossad, who used a one-ton remote-controlled gun smuggled into Iran piece by piece over eight months, the JC can disclose
The Iranian nuclear scientist who was shot dead near Tehran in November was killed by a one-ton automated gun that was smuggled into the country piece-by-piece by the Mossad, theJCcan reveal.
The 20-plus spy team, which comprised both Israeli and Iranian nationals, carried out the high-tech hit after eight months of painstaking surveillance, intelligence sources disclosed.
The Tehran regime has secretly assessed that it will take six years before a replacement for top scientist Mohsen Fakhrizadeh is fully operational.
Meanwhile, Israeli analysts have concluded that his death has extended the period of time it would take Iran to achieve a bomb from about three-and-a-half months to two years —…
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