Mag Spring Storage Clip
thingiverse
It's a clip for your spring for your mag for your fun. Holds a standard capacity (30/20) magazine in a compressed state to more easily fit in small spaces. Can't find a photo of it, so I included a gratuitous photo of high capacity ammunition for you guys. Seriously, storing a spring compressed doesn't degrade it, unless you are storing that compressed spring in salt water or a furnace.
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