arma impropria. These regulations also apply, a Sentenced by the Corte di Cassazione, to machetes (considered developed as an agricultural tool), to scuba knives, as it is considered a sport tool, and to many types of knife (the distinguish point for knives is use, purpose and common characteristics with daggers, such as double sharp cutting edge). Proper weapons are the most regulated and limited, and are distinguished in cold and fire weapons. Cold weapons are regulated according to their purpose and can be divided in "subjected to declaration" or "not subjected to declaration". The first category included all weapons (swords, daggers, sabers, battle axes and others) that are sharpened and cannot in any case be brought out of the house when owned. The latter category includes the same weapons that are not sharpened and used as collection, ceremony and so on. Fire weapons, or firearms, are then regulated in different ways and limited in quantity or usage. Italian gun laws impose restrictions to the kind of firearms, calibers and magazine available to civilians. Category A - Prohibited includes all military exploding weapon, automatic firearms, guns disguised as other object (so, never approved by the national commission), exploding, perforing, or incendiary rifles, including any ammunition, expanding bullets, automatic rifles turned into semi-automatic ones. Other limitations apply to number of bullets without recharging, and other technicalities. This category also includes Full-automatic and select-fire firearms (machineguns), grenade launchers, suppressors, destructive devices and all other kinds of military weapons and ammunition, semiautomatic pistols in caliber. Category B - Authorization Required includes different kind of Semi-automatic firearms with limited number of bullets or other peculiarities; includes also single-shot rifles and guns. Category C - Declaration to authorities Required includes semi-automatic rifles, single or multiple shot long rifles, and other firearms with characteristics and technicalities different from the one in Category B. Note that, de facto Category B and Category C have no difference in possession requirement or authorization by authorities, as any unforbidden firearm is subjected to license. Noise Suppressor are restricted for the civil market, they cannot be imported or fabricated since 2010, but previous sold or imported ones can be detained declaration required. 5.56×45mm NATO is forbidden but .223 Rem is permitted; 7.62×51mm NATO is forbidden but 308 WIN is permitted. Magazine alone are not traced nor need to be denounced, but the ones with capacity greater of 20 rounds for pistols or