Accelerationism is petty bourgeois nonsense from people that don’t want to contend with the struggle of organizing as leftists in the imperial core. It’s also used as a boogeyman by “reformists” to juxtapose themselves against something that isn’t Marxism.
Under the dictatorship of the proletariat firearms would have to be restricted so that reactionaries could not access them. As the transition to communism progressed there would eventually be a point where weapons wouldn’t need to be controlled. Under capitalism gun control, like all laws of the bourgeois dictatorship, will only be used to maintain the supremacy of the bourgeois class.