I just bought a 10 rd magazine for a used 380 I purchased. The mag is very hard to get to seat. The last quarter inch or so I really have to hit it to get it to lock into place. When I hit the release it only drops out about a half inch then I have to pull it out. Feels like it is rubbing something on the way in the last little bit up near the feeder. Tried oiling it didn't seem to help. Fires fine just seems like it shouldn't be that hard to lock it in. Any thoughts?