I have a problem with my new Pmags not dropping free as well. I at least 2 pmags of almost every batch, old style to new, and all of them have dropped free until the newest batch that is currently out. The windowed mags with numbers on them. And the newest ones don't drop free. I believe i have narrowed it down to the very top lips, I sanded them down a little bit and it drops free now. But I dont really like sanding on the mags so I've only done it to one. One of my like 10 of the newest style.