60In the third place, to the extent that the Republic of Poland submits that the prohibition on the marketing of certain categories of firearms does not facilitate the functioning of the internal market and that the contested directive gives rise to new obstacles to the free movement of firearms for civilian use, first, it should be recalled that, by using the words ‘measures for the approximation’ in Article 114 TFEU, the authors of the Treaty intended to confer on the EU legislature a discretion, depending on the general context and the specific circumstances of the matter to be harmonised, as regards the method of approximation most appropriate for achieving the desired result, in particular in fields with complex technical features (judgment of 4 May 2016, Poland v Parliament and Council, C‑358/14, EU:C:2016:323, paragraph 37 and the case-law cited).
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