So, looking at the prohibited list:
1. Any machine gun, sub-machine gun or other firearm
capable of propelling projectiles in rapid succession
during one pressure of the trigger.
2. Any self-loading rimfire rifle (including any such
firearm described elsewhere in this Schedule).
3. Any self-loading centre-fire rifle (including any such
firearm described elsewhere in this Schedule).
4 . Any self-loading or pump action shotgun (including any
such firearm described elsewhere in this Schedule).
5. Any self-loading centre-fire rifle of a kind that is
designed or adapted for military purposes.
6. Any self-loading shotgun of a kind that is designed or
adapted for military purposes.
7. Any firearm that substantially duplicates in
appearance (regardless of calibre or manner of
operation) a firearm referred to in item 1, 5 or 6.
8. A firearm, not being a pistol, of the Uberti or Armi-
Jager brands, or any similar firearm fitted with a
revolving ammunition cylinder (other than a firearm
manufactured before 1920).
9. A shotgun fitted with or designed to be fitted with a
drum magazine of the “Striker 12” assault shotgun
type or any similar weapon.
10.Any firearm to which there is attached any article or
device capable of muffling, reducing or stopping the
noise created by firing the firearm.
11.A firearm, not being a pistol, fitted with a stock that
is specially designed so as to be readily detachable, or
to operate on a swivel,folding or telescopic basis.
12.A firearm made up in the form of a stylographic or
propelling pen or pencil, capable of being used for the
discharge of gas, bullets, shot, dye or pyrotechnic
flares.
13.A firearm capable of discharging by any means:
(a) any irritant matter in liquid, powder, gas or
chemical form, or
(b) any pyrotechnic flare or dye, or
(c) any article known as a “paint-ball”.
14. A firearm that:
(a) substantially duplicates in appearance some
other article (such as a walking stick, walking
cane or key ring), and
(b) disguises or conceals the fact that it is a firearm.
15. A cannon or other weapon by whatever name known
of a type which will expel a projectile by the action of
an explosive or other propellant, and which has a
barrel with a bore in excess of 10 gauge, not being a
firearm of the Very or rocket type designed and
intended for use for life saving or distress signalling
purposes, an antique muzzle loading firearm, or a rifle
or shotgun manufactured before 1920.
16. Any firearm which, or part of which, has a dimension
less than the minimum dimension prescribed for the
firearm or part by the regulations.
17. Any imitation or replica of any firearm (including any
imitation or replica pistol, blank fire pistol, shortened
firearm, machine gun or sub-machine gun) unless it is
of a type approved by the Commissioner.
18. Any device known as a “powerhead” that can be
attached to the end of a spear gun and that is
designed to propel a projectile by means of an
explosive.
You can own a single shot... as long as it doesn't have a silencer or look like anything else?