These are really awesome looking mags. I love the fact they are ribbed and the window showing the cartridges is great. Almost like the real thing, the real ones actually stack the cartridges alternate left/right rather tahn vertically above each other but just a small critism.
Some experience a small issue with misfire due to too much tolerance in teh runner.
A fix here http://www.youtube.com/watch?v=fPOBlnnSkh8&context=C3377-
No need to use silicon to lube teh runner!! The issue is not a lube issue!
What I would say is the other main factor causing misfire is due to movement of the magazine in the mag well rather than the mag itself. This can be fixed with a velcro pad in the mag well and tuning the mag release catch to fit snug.