Now the country's interior ministry is pushing a constitutional change that would let citizens use guns against terrorists. Proponents say this could save lives if an attack occurs and police are delayed or unable to make their way to the scene. To become law, Parliament must approve the proposal; they'll vote in the coming months.

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The Czech Republic already has some of the most lenient gun policies in Europe. It's home to about 800,000 registered firearms and 300,000 people with gun licenses. Obtaining a weapon is relatively easy: Residents must be 21, pass a gun knowledge check and have no criminal record. By law, Czechs can use their weapons to protect their property or when in danger, although they need to prove they faced a real threat.

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This puts the country at odds with much of Europe, which has long supported much more stringent gun-control measures. In the wake of the 2015 terror attacks in Paris, France pushed the European Union to enact even tougher policies. The European Commission's initial proposal called for a complete ban on the sale of weapons like Kalashnikovs or AR-15s that are intended primarily for military use. Ammunition magazines would be limited to 20 rounds or less.

The Czech Republic came out hard against the directive. Officials warned — somewhat ominously — that the measure would limit the country's ability to build "an internal security system" and make it nearly impossible to train army reservists. And a total ban on military-style rifles that can fire large numbers of rounds would make illegal thousands of weapons already owned by Czech citizens, potentially creating a black market for terrorists to exploit. Finland and Germany offered their own reservations; Europe's pro-gun groups also mobilized against the bill with the support of politicians on the extreme right.

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After months of contentious negotiations, the EU passed a compromise last month; the Council of Ministers will confirm the measure this spring. All member states will have 15 months to comply with the new gun restrictions. The final measure bans the sale of most military-style rifles and requires all potential buyers to go through a psychological check before they can buy a weapon. If someone fails a check in one E.U. state, that information will be shared in an international database so that the person can't procure a gun somewhere else. Online sales are also severely curtailed. The Czech Republic was the only country to oppose the directive for being too strict. Luxembourg also voted against the measure, but on the grounds that it was too weak.

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