I'm not sure I can really do much with them as the slots in the metal top are of a pre-determined size so to make it work with that I pretty much have to exactly match them.
I think this one would work if the latch maintained enough "spring" to engage the catch. Only thing as noted before would be finding an appropriate spring. Using something like an AR mag spring would likely require a specially designed follower setup to mate with that type of spring.
Of course a stock follower + spring out of an AR-10 magazine might work. I'd need to grab one since I only have AR-15 magazines lying around. I might try to order one of those soon.
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