I had the opposite experience. Bought a SU.16. When I tried to sight it in it wouldn't zero, neither the iron sights or when I tried 2 different scopes with different mounts. I am sure the reciever wasn't aligned with the barrel. I sent the rifle back, it took forever to get it back. Now the iron sights will zero, they put on a new front sight assembly and alligned it better, but they did nothing to fix the misaligned reciever. I put the same scopes and same mounts back on and they shot exactly where they had when I gave up trying to zero them.