NavyLT, I recall clearly the M16 BFA having holes in them.
How? Because I remember having to clean the weapon and the BFA after using the darn things. Talk about a mess.
NRA Chief Range Safety Officer, Home Firearm Safety and Basic Pistol Instructor
"There are three classes of people: those who see, those who see when they are shown, those who do not see."
Leonardo da Vinci