Like ocean water and the hulls of deep draft ships... Any possible way to get through, they will try. That is why hulls are constructed with multiple reinforcements in addition to sealable compartments inside in event of a leak somewhere.
The goal of the statists is COMPLETE disarmament, and if they cannot get it right away, they are more than content with incremental infection. Today, machine guns. Tomorrow, "assault rifles". Next week, "sniper rifles". And if they cannot progress on their main line of advance, they will spread out and try to flank. Ammunition, types of ammunition, lead bullet bans for made up environmental concerns, shooting ranges, redefinition of land acceptable to construct shooting facilities, banning CCW in "public places", anything to try to hinder, disrupt, cause a nuisance, and extort money along the way.