Originally Posted by Argyle_Armoring
Only if you use LEO ONLY armor piercing rounds. Normal civilian 5.7x28mm rounds won't damage the plates. Most other competitions require a 9mm or larger round and the 5.7 is not large enough.
Old club I shot at banned all of it due to issues with steel. Could have just been there poppers, or they didn't feel like inspecting everyone's ammo.