For what it’s worth, the far left (internationally) is traditionally pro-gun. I wouldn’t know what positions are about any citizen and any gun, but I wouldn’t be surprised either to hear a socialist advocate for it.

Obligatory:

[…] The whole proletariat [i.e. worker class] must be armed at once with muskets, rifles, cannon and ammunition, and the revival of the old-style citizens’ militia, directed against the workers, must be opposed. Where the formation of this militia cannot be prevented, the workers must try to organize themselves independently as a proletarian guard, with elected leaders and with their own elected general staff; they must try to place themselves not under the orders of the state authority but of the revolutionary local councils set up by the workers. Where the workers are employed by the state, they must arm and organize themselves into special corps with elected leaders, or as a part of the proletarian guard. Under no pretext should arms and ammunition be surrendered; any attempt to disarm the workers must be frustrated, by force if necessary. The destruction of the bourgeois [i.e. owner class] democrats’ influence over the workers, and the enforcement of conditions which will compromise the rule of bourgeois democracy, which is for the moment inevitable, and make it as difficult as possible – these are the main points which the proletariat and therefore the League must keep in mind during and after the approaching uprising.