Have 2 TRP's . As I've got a slew of 1911's I've got a bunch of mags . IIRC it was the 47D's that some reported having problems with . I believe Wilson has a newer model that is trouble free . I've never had an issue with Wilson mags , Checkmate mags are good , Tripp's are good . If one gives you problems , new springs , followers are cheap & feedlips can be fixed most of the time . IMHO mags , internal springs are considered consumables in a 1911 platform .