12A.— (1) Subject to subsection (2), a person who shortens the barrel of—

(a) a shot-gun to a length of less than 61 centimetres, or

(b) a rifle to a length of less than 50 centimetres,

is guilty of an offence.

(2) It is not an offence under subsection (1) for a registered firearms dealer to shorten the barrel of a shot-gun or rifle to a length of less than 61 or 50 centimetres respectively if the sole purpose of doing so is to replace a defective part of the barrel with a barrel of not less than 61 or 50 centimetres, as the case may be.

(3) It is an offence for a person to convert into a firearm anything which resembles a firearm but is not capable of discharging a projectile.

(4) Subject to subsection (5), it is an offence to modify a firearm so as to render its reloading mechanism fully automatic or to increase its calibre, irrespective of whether the firearm, as so modified, is a restricted firearm.

(5) Subsection (4) does not apply to a firearm designed and manufactured so as to enable barrels of different calibres to be attached to it.

(6) It is an offence for a person (except a registered firearms dealer) to possess without lawful authority or reasonable excuse—

(a) a shot-gun the barrel of which is less than 61 centimetres in length,

(b) a rifle the barrel of which is less than 50 centimetres in length,

(c) a converted firearm mentioned in subsection (3), or

(d) a firearm which has been modified as described in subsection (4).

(7) A person who is guilty of an offence under this section is liable on conviction on indictment—

(a) to imprisonment for a term not exceeding 10 years or such shorter term as the court may determine, subject to subsections (9) to (11) of this section F30[…] and

(b) at the court’s discretion, to a fine of such amount as the court considers appropriate.

(8) The court, in imposing sentence on a person for an offence under this section, may, in particular, have regard to whether the person has a previous conviction for an offence under the Firearms Acts 1925 to 2006, the Offences against the State Acts 1939 to 1998 or the Criminal Justice (Terrorist Offences) Act 2005.

(9) Where a person (other than a person under the age of 18 years) is convicted of an offence under this section, the court shall, in imposing sentence, specify a term of imprisonment of not less than 5 years (in this section referred to as the “minimum term of imprisonment”) as the minimum term of imprisonment to be served by the person.

(9A) The purpose of subsections (10) and (11) is to provide that in view of the harm caused to society by the unlawful possession and use of firearms, a court, in imposing sentence on a person (other than a person under the age of 18 years) for an offence under this section, shall specify as the minimum term of imprisonment to be served by the person a term of not less than 5 years, unless the court determines that by reason of exceptional and specific circumstances relating to the offence, or the person convicted of it, it would be unjust in all the circumstances to do so.

(10) Subsection (9) does not apply where the court is satisfied that there are exceptional and specific circumstances relating to the offence, or to the person convicted of it, which would make the minimum term of imprisonment unjust in all the circumstances, and for this purpose the court may , subject to subsection (11), have regard to any matters it considers appropriate, including—

(a) whether the person pleaded guilty to the offence and, if so—

(i) the stage at which the intention to plead guilty was indicated, and

(ii) the circumstances in which the indication was given,

and

(b) whether the person materially assisted in the investigation of the offence.

(11) The court, in considering for the purposes of subsection (10) of this section whether a sentence of not less than 5 years imprisonment is unjust in all the circumstances, may have regard, in particular, to—

(a) whether the person convicted of the offence has a previous conviction for an offence under the Firearms Acts 1925 to 2006, the Offences Against the State Acts 1939 to 1998 or the Criminal Justice (Terrorist Offences) Act 2005, and

(b) whether the public interest in preventing the unlawful possession or use of firearms would be served by the imposition of a lesser sentence.

(12) F30[…]

(13) F30[…]

(14) Section 27C of the Firearms Act 1964 applies in relation to proceedings for an offence under this section and any minimum term of imprisonment imposed under subsection (9) F30[…] in those proceedings.