i made a single shot gun and am trying to convert it to semi auto....
https://www.instructables.com/id/Knex-Small-Assault-Rifle/https://www.instructables.com/id/SSMKG-knex-gun/www.instructables.com/id/Project-NASA/ Have a look at all of these hope that helped!
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A good semi auto mag would be a horizontal tubular mag like ooda has on his first semi auto.
a good regular mag would not have a middle, unless its a removable mag.
hoppers are the best when they are wider than the ammo. they have little friction.
You need as little friction as possible. The burrito master's mag on the SCAR is brilliant because it is solid yet it has as little contact with the ammo as possible. I recommend having guides at the side and nothing in the middle. Search for K'nex magazines on here, there is an instructable on how to make 8/15 round mags, as well as a few others. Good luck!