Manufacturer Part Number ( MPN ) : TC-MAG0930The next generation of AR magazines has arrived and INTRAFUSE® is at the forefront with our 30rd Gen II AR Magazine. It still retains the rugged mag body that the original had, but we’ve made vast changes to the interior components to improve the overall functionality of the magazine. First, we’re making the spring out of premium 17-7 Stainless Steel. Second, we’ve redesigned the shape to make it smoother, quieter, and easier to load all 30 rounds. Plus, we've made changes in spring tension to cut back on the stress put on the mag body when fully loaded, making spine cracks something you'll never have to worry about. But we didn’t just stop on improving the spring, we also totally revamped the follower. We’ve kept the anti-tilt design but the Gen II follower allows more dirt and grime to pass through the magazine so there won’t be any feeding errors no matter what kind of debris has entered the magazine. Along with these interior design changes, the Gen II magazine does away with the rare drop-free issue that some users were experiencing with the first generation mag.