Originally Posted by Justintoxicated
if they can remove the block from the mag without any tools I don't think it is permanent. If you can without any tools dissemble into parts then reassemble into a 30 rounder, the modification done might not and probably would not be defined as permanent. I'd rather not chance getting a felony, losing my job, and house, and possibly jail time over neglecting to pop in a rivet.
I think the only topic debated more than what "permanent" is, is "AR vs. AK."
And Rritterson made a good point that I had forgotten, when you are using Pmags with their blocks, you actually toss the bottom sping plate. Without that plate, you can't assemble it into a functioning magazine without the block anyway.