Fits m&p shield 9mm and 9mm 2.0.For use with.40 s&w 1.0 and 2.0 use factory spring.Not compatible with shield 9mm ezmp shield mag extension adds 2 rounds to both the factory 7 and 8rd magazines.Uses factory sleeve when used with the 8rd magazine.Custom engineered spring.Optimal ergonomics and texture for recoil control.Adds 1rd and requires use of factory spring for shield.40 s&wCaliber: 9mmModel: MTXMagazine 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.