The 15-year-old, who cannot be named for legal reasons, held up a branch of Barclays bank in Liverpool, northwest England, on Friday and made off with 2,000 pounds (USD 3,200), the city's youth court heard.
His mother turned him over to the police after finding a stack of cash and the fake weapon in his bedroom.
She wept at the back of the courtroom as her son, wearing a black suit, white shirt and tie, was led into the dock and pleaded guilty.
"This is a very serious matter," the judge told the court.
"It's an armed robbery, but not in the conventional sense most people would recognise.
It's a bizarre, surreal case of a young man almost acting like a real-life action video game."
Prosecutor Debra Chan said the boy had walked into the bank with a scarf over his face, pulled out the gun and told cashiers: "Don't do anything stupid. I have just got out of prison after five years."
The cashiers filled the bag with a "dummy bundle" which is designed to spray dye over the cash when it leaves the building, Chan said.
The court heard that the boy was a "model pupil" at school who was not known for misbehaving.
Defence lawyer Esther Leach said he came from a "very, very good family" and was doing "fantastically well at school".
The boy pleaded guilty to two counts of robbery and one count of possessing an imitation firearm with intent to cause fear of violence, and was granted conditional bail.
He will be sentenced at Liverpool Crown Court on October 15.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
