Quote History Yup, was gonna post this. Make sure any ALS holster you get for a 2.0 is made for a 2.0, not a 1.0.
The ALS mechanism locks into the ejection port to lock the gun into the holster. On the 2.0, the slide is a little thinner at the cut on the top of the slide at the ejection port than the 1.0. In contrast, the wider part of the slide below the ejection port, where the frame rail cuts are, is a tad wider on the 2.0. Because of this, if you try to use a 1.0 holster for a 2.0, it is possible to let the gun release from the holster without hitting the thumb release, if you twist the gun in the holster enough. such as if you were trying to defend against someone grabbing the gun. Alternatively, I have heard that the 1.0 locking bar can lock a 2.0 in the holster, to the point that you can't get it out without disassembling, and possibly ruining, the holster.
It shouldn't be a big deal now to get a 2.0 holster. Just make sure it specifies that it fits the 2.0. When I tried to get a duty holster for my personally owned 2.0 for my PD job, 2.0s were relatively new on the market and I had to order directly from Safariland, because 2.0 holsters weren't out in the wild yet. Safariland couldn't tell me how long it would take, just that they were working on a fix and would ship me one when they had it worked out. It ended up taking 8 weeks from time of order to receipt of the holster. It wasn't really a big deal since I wasn't able to qualify with the gun for some time after receiving the holster, but it was frustrating because I had no holster to train with the gun while I waited for the qualification date. Shouldn't be a big deal now, like I said, just make sure the holster specifies it is for a 2.0.