Keith King was carrying the gel blaster, which strongly resembled a Glock pistol, in his backpack when he saw police.

He ran, fearing they would arrest him for a breach of parole, but it was only because of this reaction that police took chase.

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King abandoned his shirt after jumping one fence and, soon after, got rid of his shorts.

Albury Local Court magistrate Miranda Moody has told King, on handing him an eight-month spell in jail, that the fact he was on parole was "an extremely aggravating factor" in his offending.

"Coming back to his record ... he's committed every offence known to man," she said.

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Ms Moody said the 27-year-old, who the court heard became addicted to cannabis aged nine and later, methamphetamine, had been imprisoned "numerous times".

And she said a prohibited weapon such as that carried by King was still highly dangerous.

"The thing is, even these weapons kill people because of the way they react to them."

King, appearing via a video link to Junee jail, pleaded guilty to possessing an unauthorised pistol, acquire a pistol while subject to a firearms order and seven charges of enter enclosed lands.

The court was told police were in Keene Street on September 8 about 3.20pm when they saw a man run through nearby bushland and into the Albury hospital grounds.

They gave chase as King leapt across several residential fences, eventually capturing him as he hid under a car in a driveway.

Police found his backpack, with the gel blaster and magazine, inside a fenced area surrounding the hospital's generator.

King will be released on parole on January 7

Ms Moody told King now was the time to change his ways.

"At this stage, if you keep offending you're never, ever going to have your freedom."

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