A lock back issue

OK my friend has had this problem twice now with two completely different .45's and today it happened in a 2700. what cause's the slide to lock back with rounds in the magazine ? is this a simple fix ?

The bullets may be seated a little long. The bullet itself is hitting the slide lock and raising it. That's one possibility.

Len

Ok thanks info passed on.

Another less likely possibility (since it happened to two different pistols) is that somehow you/they have ended up with 9mm or 40cal slide locks in the 45's. They are just enough longer internally to hang up on ammo that wouldn't normally be a problem. They are not interchangeable.

Len

as Len said it most often is the bullet hitting the stop.. Look at the stop for wear on it's tip

Most all 9mm/38 super stops are marked on the inside  "9mm"

interesting stuff, I know he has the correct slide stop in both .45's. For what it's worth one .45 is a Clark and the is a stainless S&W . The length of his bullets is probably it. Could have anything to with the magazines ? and thanks for the help Len and jglenn21.

One small and often overlooked thing is inadequate crimp and the resulting bullets walking out of the case.

Thanks Wobbley I've got him checking on that right now.