What makes the raid even more shocking is the masked gunman is just 15 years old.

Shopkeeper Phil Kumar was working alone in the Blackpool Key Centre on Hawes Side Lane, Marton, when the gun-toting teenager burst in and shoved a gun in his face.

A terrified Mr Kumar handed over £70 and the robber fled with the cash.

He was assisted in the robbery – on March 13 – by a 16-year-old accomplice who had previously "cased" the premises.

The teens were arrested after being recognised from CCTV footage taken from inside the store.

Both pleaded guilty to robbery when they appeared before Preston Crown Court yesterday.

The gunman, who is now 16 but cannot be identified for legal reasons, also admitted possessing a firearm, namely a BB gun.

Det Sgt Steve Colman, of Blackpool Police's robbery squad, said: "This was a terrifying incident for Mr Kumar who was working alone in the shop.

"He didn't know it was a replica firearm and thought he was going to be shot.

"It's concerning to see boys of this age willing to commit crimes of this level."

Both youths could now face a lengthy spell in youth detention when they are sentenced next month.

Mr Kumar, 56, today told The Gazette: "They're just young lads and it's a shame they're wasting their lives away.

"I'm glad the police caught them because if they had got away with it they'd do it again. They're on record now for robbery at gunpoint.

"I just froze when I saw the gun pointed in my face. It frightened me. I hope these boys learn their lesson."

Mr Kumar said the parents of the boy armed with the gun have been to visit him to apologise for their son's actions.

Det Sgt Colman said anyone using a gun – fake or real – was playing a dangerous game.

He added: "Using a firearm can have serious consequences. The police will send out an armed response unit who could shoot them dead or cause them serious injury.

"We must treat every incident as though it's a real weapon and if an officer was to shoot a boy who had a replica gun that would be difficult to live with.

"I'm sure the owner of the store will be happy these two teenagers have pleaded guilty. The offenders themselves should be given credit for admitting their crime at the first opportunity.

"The sentence will reflect the severity of the offence which is at the top end of all crimes."

Judge Christopher Cornwall adjourned the hearing until June 13 for pre-sentence reports to be prepared.

One of the youths had his unconditional bail extended, while his accomplice was remanded into local authority care.