Product Description The ProMag Industries AR-15 5.56mm Roller Follower 30-Round Transparent Polymer Magazine (RMT-30) is a premium, American-made magazine built for dependable performance in AR-15 platform rifles chambered in 5.56mm. The clear transparent body is constructed from a proprietary DuPont Zytel-based polymer, allowing shooters to instantly monitor round count without removing the magazine. Backed by a lifetime guarantee against manufacturer&';s defects, this magazine delivers the consistency and durability that ProMag is known for. Every assembly step is checked and double-checked to ensure a consistent level of quality, while the patented anti-tilt roller follower and precision-wound chrome silicon wire spring work together to provide smooth, reliable feeding from first round to last. Product Highlights 30-Round Capacity: Designed specifically for AR-15 rifles chambered in 5.56mm for full-capacity use Transparent Polymer Body: Proprietary DuPont Zytel-based polymer construction provides instant at-a-glance round count visibility Patented Anti-Tilt Roller Follower: Reduces feeding failures and ensures smooth, consistent cartridge presentation Precision-Wound Spring: Heat-treated chrome silicon wire spring delivers reliable cycling and long service life Made in USA with Lifetime Guarantee: Manufactured domestically and backed against manufacturer&';s defects for total peace of mind Specs Brand: ProMag Industries MPN: RMT-30 UPC: 708279017223 Caliber: 5.56mm NATO Capacity: 30 Rounds Compatible Firearm: AR-15 Body Material: Transparent Polymer (Proprietary DuPont Zytel-based) Spring Material: Heat-Treated Chrome Silicon Wire Follower Type: Patented Anti-Tilt Roller Follower Type: Magazine Country of Manufacture: USA Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.