Unknown magazines

[coyote]

My team used to run scenario events. I believe these were orphans from our "lost and found box".

I don't know what platforms they fit. I don't know if they are functional, but they appear to be.

What are they, and what would be a generous asking price?
PXL_20230620_175438935.jpg PXL_20230620_175431662.jpg

[Carp]

Helix mags from mcsus.com

[coyote]

Thanks.