On 2 July 2009, the New Zealand Police issued a memorandum advising that the police had reviewed the criteria for classifying weapons as MSSAs; and in particular the interpretation of the phrase 'military pattern free-standing pistol grip' used in the legislation. Under the new interpretation, many types of thumbhole stocks were now to be considered as pistol grips for the purposes of the Arms Act; any
semi-automatic rifle with a grip having
either the appearance or function of a military pattern free-standing pistol grip would be regarded by the police as an MSSA. Specifically, a semi-automatic rifle would henceforth be considered an MSSA if it had any of: • an obvious pistol grip below the
trigger guard allowing a full-hand pistol grip, irrespective of whether or not the pistol grip was connected to the stock at the base; • any addition that connects the pistol grip to the stock or butt in an attempt to make it no longer free standing (such as adding a metal or plastic rod); or • a second grip forward of the trigger. This reinterpretation had the effect of re-classifying as MSSAs many weapons previously considered to be sporting-configuration firearms, including the
Heckler & Koch SL8 and
USC, and the
Dragunov sniper rifle. Transitional arrangements were made by the police to allow owners of such weapons to either register them, obtaining the necessary firearms endorsements if required, or dispose of them. The transitional period ended on 31 March 2010. The reinterpretation has met with resistance from some firearm owners. The National Shooters Association of NZ (formed largely as a result of the reinterpretation) laid a complaint on 12 August 2009 with the
Independent Police Conduct Authority regarding the advertising of the change. Proceedings had already been lodged by the Association's president Richard Lincoln at the High Court in Palmerston North on 29 June 2009, aiming to have the revised interpretation overturned. In a subsequent hearing for an injunction to protect the litigant, Justice McKenzie ruled that the police did not have the power to re-classify any firearm and that their opinion on the extended definition of pistol grips was "inconsequential" and that was a matter for the Court to decide. He also stated that the Court would not be constrained by any other 'opinion'. On 1 March 2010 Justice Mallon released a Reserved Decision upon the Judicial Review, stating that a Military Pattern Free-Standing Pistol grip was not what the Police HQ said it was and that the litigant's H&K SL8 firearm did not have a Military Pattern Free-Standing Pistol Grip. Justice Mallon discussed the proper interpretation of the terms 'Military Pattern' and 'Free-Standing' in detail. The police have ceased advertising their opinion and removed reference to the "Check Your Stock" campaign from their official website. == 2012 amendments ==