458 was designed to work with standard gi mags as-is. If you have feeding issues normally polishing the ramp is what fixes it if it is not feeding. If you live in a state like I do that limits capacity, then these are good because you can get a 30rd rebuild kit online, put this in and destroy the original follower, and you now can legally own the magazine. That is because this is stamped with caliber and limits to 10 (the standard mags sometimes allow 11). My only negative for these is the color options but it is fine, you just have to load it.
