I don't know why, but I have had zero luck with Wilson mags, they have a good rep, appear well made, have great features for cleaning etc... but I have 4, two 8 rounders, and 2 six rounders for my little Para's, no dice.
I have 5 single stack working 1911's, I have had great luck, with metal form, with or without the plastic slam pads, Mec-gar, who look identical to metal forms, and Chip McCormick 10 rounders, the 10 rounders feed in all my pistols, but do not lock the slide back on the last shot 90% of the time. But being able to start with 11 rds of .45 to start with is worth it IMHO.