Someone explain rebuild magazines to me

[Turo]

cool.. thanks for clearing that up.. but just to be safe, does this mean i can buy a glock 33 rnd mag rebuild kit?

Yep. As long as you don't manufacture a new magazine with it.

[mdouglas1980]

You can assemble mag parts into new magazines that have been permanently altered to only hold 10 rounds though. Just not manufacture a new high-capacity magazine, that would be breaking the law.

[Rob454]

cool.. thanks for clearing that up.. but just to be safe, does this mean i can buy a glock 33 rnd mag rebuild kit?

As long as you are not buying it to construct a NEW 30 round mag and are using it to either fix a EXISTING 30 round mag or simply buying it for when you go out of state or hopefully someone decides to lift the gun laws.
But yes you can purchase a mag kit.