The 42-10 is a magazine floor-plate replacement for the glock 42 (.380 acp) that adds 4 rounds for a total of 10 rounds in a magazine.The special ergonomic design enables secure manipulation of the magazine and a full grip on the weapon when the magazine is in use.Caliber: 380 ACPCapacity: 4rdFinish: BlackModel: Mag ExtensionMaterial: PolymerModel Fit: G42Brand Fit: GlockCapacity: 4Magazine Restrictions: The following states have magazine restrictions. Your order will not ship to those states if in violation of these laws and will be subject to cancellation and a 15% restocking fee. California - Limited to 10-round capacity. Connecticut - Limited to 10-round capacity. Colorado - Limited to a 15-round capacity. Delaware - Limited to 17-round capacity. Hawaii - Handguns limited to 10-round capacity Illinois (Cook Co, Aurora, Highland Park) - Pistol mags are limited to 10 rounds. Massachusetts - Limited to 10-round capacity. Maryland - Limited to 10-round capacity. New Jersey - Limited to 10-round capacity. New York - Limited to 10-round capacity. Road Island - Limited to 10-round capacity. Vermont - Handguns limited to 15-round capacity, Rifles limited to 10-round capacity. Washington DC - Limited to 10-round capacity. Washington - Limited to 10-round capacity.