Series 1 had a hard time seating in just about all of my ARs. Closed bolt. Open bolt. Fully loaded. Barely loaded. It didn’t matter. Push/pull wasn’t enough. They required a hard smack to seat. Even then, they wouldn’t seat every time.
The Series 2, on the other hand, have been great. Which they sent me to replace all the Series 1s I’d purchased. Tossed in some extra swag and even let me keep the Series 1s (unfortunately they’re just collecting dust).
I’ve seen some pretty impressive torture tests conducted on the Hexmags. The fit and finish is very nice. I haven’t beat on them. Haven’t babied them either. They’ve been perfectly reliable.
I’m guessing you can’t even get the Series 1 anymore. So I’d recommend them with confidence. If there’s an issue, their CS is outstanding!