Atlas Gunworks has been working for the last 2 years on a high capacity 9mm magazine for high capacity 2011 platforms. Introducing the Atlas Gunworks Perfect Feed 9mm HiCap 2011 magazines. New internal dimensions greatly improve feeding in all double stack 2011's. The new upper tube dimensions paired with a proper follower make reliable lockback achievable. Designed to work with all modular grip double stacks in 9mm, .38 super, and .38 super comp. 140MM Magazine Capacity is 21 rounds Available in stainless steel and black DLC coated stainless steel Redesigned, dimensionally correct magazine body +18% spring for reliable feed and lockback Premium fo Mfg: Atlas Gunworks