Magpul Industries PMAG, .223 Remington/556NATO, Designed For Users Who Reside in Areas With Magazine Capacity Restrictions But Desire a Standard 30-round Magazine Form, 10 Rounds, Fits AR Rifles, Black MAG1183-BLK Magpul's PMAG 10/30 was designed for users who reside in areas with magazine capacity restrictions but desire a standard 30-round magazine form. The PMAG 10/30 provides the same next-gen impact and crush resistance" constant curve geometry" and long-life stainless-steel spring to ensure smooth feeding. They've added a proprietary lock plate that reduces the maximum capacity to 10 rounds" and it's permanently secured by an aluminum rivet. A lock plate tab that's clearly marked for capacity is also included.