Jurors at the trial saw dramatic footage of Coleman dropping £3,500 in a Land Rover and picking up a holdall containing the handgun and ammunition from the boot in a Morrisons car park in Stratford on 23 September 2023.
Moments later, Coleman was confronted by armed counter-terrorism police and lay on the ground.
Investigators later found a “manifesto” in his diary, where potential targets for an attack included the Lord Mayor of London and a mosque.
Prosecutor Nicholas de la Poer KC said that two days before Coleman was due to pick up the Makarov, he wrote: “Something has gotta be done, how long can we sit here and talk over the internet?”
The same day, Coleman went online and ordered a Gerber Strongarm knife with a 4.8in (12cm) blade.
He first began trawling the internet for extreme right-wing material aged 14, downloading a neo-Nazi text to his iPad.
Authorities noticed his extreme views as he became increasingly active in far-right online groups in summer 2023, and Coleman pieced together a plan to attack a mosque in France, which was later abandoned.
