As you say Peter, mechanically the same, new body, full length rail and up to date go faster forend.
I would assume it's as reliable as the A2, it certainly should be.
---------- Post added at 03:50 PM ---------- Previous post was at 03:46 PM ----------
I guess it's different stokes for different folks, I know one chap who used the A2 in a few tours of Afghanistan (with the usual sand pit taping up), he said it's just fine...
Perhaps given a choice though!