Magblock 10 Round Limiter for New Pmag 30 Gen M3 (3 Pack) Installs in PMAG 30 round bodies, reducing the magazine capacity to 10 rounds Magblock 10/30 Magazine Capacity Limiter for Magpul 30 round Gen M3 Pmags in .223/5.56mm. Includes 3 in a pack Works in new Pmag Gen M3 30 round magazines. Will not fit MOE Gen 2 30 round or 20 round Gen M3 Pmags. Made in the USA