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Retention is strong but it's smooth to insert and remove. I've tested it with stribog mags, mp5 mags, vityaz mags, and colt mags. The colt mags don't want to stay retained but everything else passed flawlessly and didn't move. Use 2 walls…
You will need some m3 allen head screws and m5 screws and nuts to assemble things. The short strut will let you get down lower on the stock if the standard one is too high. It's recommended to print all the structural parts with 10 walls…
The fan pictured is a Gaiatop portable clip on fan from amazon, pretty sure it's just a rebadged mass market fan so it should work with a bunch of other ones. Prints with the fan side touching the build surface, no supports necessary.
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