For those of you who own or might be interesting in owning one of the 22LR models, it is well known that the magazines do not hold open when the last round is fired.
Well, I came across a Canadian Company the makes Magazines that will lock the slide back......'GSdesigns'. If you Google them, they should pop up.
The reviews I've found say they work as advertised and exhibited no load/feed/ejection issues.
I have ordered 2 of there Mags and will report out once I get in hand and run them through my P229 22LR @ the Range.....Stay tuned