I recently purchased a used G30sf, with 3 mags. It's a late manufacture G30, but one of the mags, is different. The spring has substancially less resistance, and had a follower #3955. Also the area behind the follower is wider, not to mention that there is not an ambi cut in the mag itself. I have tried to research the follower, baseplate etc. Is this an older G30 mag? Follower is sort of loose from front to rear, and spring is really very easy to depress. It will be several weeks before I can to to the range, but I already do not have much confidence in this mag, and wonder if I should just toss it, or were the older ones that much different? thanks for any help comments.