History has shown what happens as soon as the guns are confiscated.
Here is an article that recounts what France endured after the gungrabbers made their move in 1935:
In 1935, French prime minister Pierre Laval, who later served in the Vichy government during the Nazis' four-year occupation of France, commanded French citizens to surrender their firearms. Laval and France's ruling parties feared social revolution and banned "war" weapons, instituting strict gun registration policies. They believed that repressive limits on civilian gun ownership were necessary at a time of Depression-sparked unrest and ongoing conflicts among various political factions. Strict time limits for firearms registration and harsh penalties for noncompliance, including forfeiture, fines, and imprisonment, were put in place. Laval's government did not foresee the impact these restrictive measures would have on a Nazi-conquered France just five years later, when firearms surrender would be required under threat of death