I bought a few last week.
Picked 2 at random, loaded both to capacity, and let loose with 2 different 17s.
They worked perfect.
I hope to get a little more range time in soon.
A few notes=
they took 21 rounds, but I loaded 20 for testing.
They latch in nice with the bolt closed and 20 rounds in the mag.
BHO activates nice.
From my limited testing, they look GTG