So far this is my third order on these things. My first order were the non window version. They ran fine in both of my Colts, (6920 and 6940). The second batch I bought were the window model.
They ran well my Bushmasters, (older Bushmaster guns before the Remington takeover). The windowed version also ran fine in both of my LWRC piston AR's.
I shot them with just 10 rounds, 30 rounds, and 40 rounds. As well as filled to capacity. The last 10 rounds were against hard spring pressure as you can imagine. I could get 62 rounds in 2 of the window mags. But only 60 in the non window.
With 60 rounds it gives quite a bit of added weight, but nothing compared to those 100 round BETA twin snail drum mags.
I didn't do any "mag dumps", but 3, 4, and 5 round rapid fire bursts all fed fine, in all of the guns, with both the window and without. Regardless of how many were in the magazine.
I run my AR very wet, with plenty of lube, and never had a misfeed. I actually found them to be as reliable as any 30 round P-Mag. Pretty much flawless.
I can't vouch for any "drop tests" because I didn't do any.
