Brownells’ new AR-15/M-16 30-round magazines are designed to feed with high reliability. The magazines are made of heavy-duty aluminum and are heat treated to MIL-STD specifications to guarantee quick insertion and an exact fit. They are also MIL-STD hard anodized with a dry-lube coating to prevent snags. The springs are made of a high-quality chrome-silicon blend to retain tension and followers are made of a plastic/glass composite for smooth feeding.