A rioter who believed the QAnon conspiracy theory and joined the insurrection by extremist supporters of Donald Trump at the US Capitol on 6 January 2021, as they attempted to overturn his election defeat, has been sentenced in New York to 3.5 years in prison.

Samuel Fisher, 33, was sentenced on Monday after being charged with illegal possession of firearms, including a modified semi-automatic AR-15-style assault rifle, a “ghost gun” pistol, a shotgun, and 11 pre-loaded high capacity magazines at an apartment in the upscale Upper West Side neighborhood of Manhattan.

He had pleaded guilty to one count of criminal possession of a weapon in the second degree.

For years, Fisher established a prolific online presence, the authorities said.

Under the alias Brad Holiday, Fisher posted photos of himself with firearms on Facebook and YouTube. In one, Fisher posed in front of a flag that said “Don’t tread on Trump. Keep America great” while grinning and holding a pistol.

“Can’t wait to bring a liberal back to this freedom palace,” he wrote as his caption. Behind him was a rifle and a shotgun.

Fisher was also a self-declared dating coach who sold a $150 package of misogynistic supposed tips and tricks for men to pick up women, called “Attraction Accelerator”, the New York Times reported.

“How to use online dating to build abundance of women! Never feel that you can’t get women again…with online dating you’ll ALWAYS be getting laid,” his website said.

In a video posted online, Fisher said, “Is Satanism a good thing? Should we conjure demons to get our goals met like the Left does?”

He added: “Are women trustworthy in 2020? You tell me. I’ll tell you, No.”

Prior to the January 6 insurrection aimed, on the urging of Trump at a rally prior, at preventing Congress from certifying Joe Biden’s victory over Trump, Fisher espoused QAnon conspiracy theories online and claims that the 2020 election was “stolen”.

In reference to a pro-Trump, so-called Stop the Steal rally, the authorities said Fisher told a Facebook friend: “Get a firearm and go, lol, its 1776 time dawg.”

He also went on to write online: “The Deep State is arrested and hanged on the White House lawn for High Treason. We rebuild America with a government for the people by the people…Patriot show up in the millions with guns. They execute all the treasonous members of government and rebuild.”

Trump believed a “deep state” secret shadow government existed to thwart his agenda.

In 2020, after attending the deadly January 6 riots on Capitol Hill, Fisher wrote on his social media accounts that “people died” but it was great, according to court records reviewed by the New York Times.

“Seeing cops literally run…was the coolest thing I’ve ever seen in my life,” he continued.

Fisher was arrested on 20 January 2021, outside his Upper East Side apartment in New York City in connection with his involvement with the Capitol attacks. Police found a shotgun, machetes and over a thousand rounds of ammunition in his vehicle, according to court records.

In a statement on Monday, Manhattan district attorney Alvin Bragg said: “Samuel Fisher is a dangerous conspiracy theorist who participated in one of the gravest attacks on our democracy. Not only did he threaten to commit violence against his fellow citizens, he had the potential to follow through with his arsenal of advanced weaponry and ammunition.”