According to VIC Law for the charge of Using firearm to resist arrest,

Crimes Act 1958 - SECT 29

Using firearm to resist arrest etc.

29. Using firearm to resist arrest etc.

(1) A person who makes or attempts to make any use of a firearm or imitation firearm with intent to resist or prevent the lawful apprehension or detention of himself or herself or any other person is guilty of an indictable offence.

Penalty: Level 5 imprisonment (10 years maximum) or level 5 fine (1200 penalty units maximum).

(2) A person who commits an offence against subsection (1) in respect of the lawful apprehension or detention of himself or herself for any other offence committed by him or her is liable to the penalty provided by that subsection in addition to any penalty to which he or she may be liable for that other
offence.

(3) In this section-

(a) firearm has the same meaning as in the Firearms Act 1996; and

(b) imitation firearm means anything which has the appearance of being a firearm whether or not it is capable of discharging any shot or other missile.

According to VIC Law for the charge of Using firearm to resist arrest,
10 years / 1200 penalty units

(a) The accused made use of or attempted to make use of, a firearm or imitation firearm.

(b) The accused did so with intent to resist or prevent the lawful apprehension or detention of the accused or of some other person.

(c) The apprehension or detention resisted or prevented was lawful.

(d) The accused knew the apprehension or detention was lawful.

(a) Duress.

(b) Factual dispute.

(c) Honest and reasonable mistake of belief.

(d) Identification dispute.

(e) Lack of intent.

(f) Mental impairment.

County Court.