Geissele ICM 6mm ARC 30rd Stainless Steel Blk Magazine 05-3233 takes the same reliability approach as the 20-round ICM and stretches it to a higher capacity - a real trick with 6mm ARC's curved case geometry, which most 30-round designs handle poorly. A two-piece curved body with full laser-welded seams is what makes that capacity work without sacrificing feed reliability, built from 410 stainless steel throughout. This Geissele ICM magazine carries the same black nitride finish as its smaller sibling, adding corrosion resistance to steel that's already built to take abuse. A stainless steel square spring drives feeding, backed by an anti-tilt follower contoured specifically for 6mm ARC's case shape. The 6mm ARC magazine's feed lips are cut for the specific cartridges it supports - 6mm ARC, .22 ARC, and 6.5 Grendel - rather than adapted from a different case profile, which matters more at 30 rounds than it does at lower capacities where stack pressure is lower. Full mil-spec compatibility means it drops into any properly chambered upper without modification. Key Features: 30-round capacity 410 stainless steel, two-piece curved design, laser-welded seams Black nitride finish Stainless steel square spring Anti-tilt follower, cartridge-optimized feed lips Compatible with 6mm ARC, .22 ARC, 6.5 Grendel Overall length approx. 8.1" Made in the USA This Geissele 30 round 6mm ARC magazine hands high-volume shooters the capacity they want without the feeding problems that usually come with it. Geissele Automatics Geissele ICM 6mm ARC 30rd Stainless Steel Blk Magazine 05-3233