A man police once linked to bikies pleaded guilty on Tuesday over a 2017 shooting and arson attack next door to a childcare centre.
At just 22 years old, Cameron Sharp has a growing number of entries for serious offences on his criminal history.
Last month he was sentenced to three years and four months in jail for his role in a violent home invasion in which a dog was shot. That dog later killed its owner in the Watson home.
Last year, he was sentenced to 15 months' jail for his role in waterboarding a person believed to have stolen drugs.
He would have been eligible for parole in March this year.
On Tuesday, he pleaded guilty to further charges arising from an incident which predates the other offences, though all were committed within months of each other.
On March 10, 2017, a house on Ellerston Avenue, in Isabella Plains, was shot at just after 11pm. The home belonged to a bikie gang member, police said at the time. A white Suzuki Swift was also set on fire.
Police caught up with Sharp in September last year and charged him with a range of offences linked to the incident.
In the ACT Supreme Court on Tuesday, Sharp was arraigned and pleaded guilty to intentionally discharging a loaded firearm, causing damage by fire to a car and unlawfully possessing a firearm.
He is due back in court on July 5 for sentence.