Does an M14 really "turn cover into concealment"? Part 3: concrete pavers

[Raggedyman]

So last time around there were some complaints that I didn't use the right kind of concrete and the test results would have been different with "real" concrete. What do you say M1A firing M80 FMJ versus 16" AR firing M855 FMJ against roughly two inch thick concrete pavers. How many do you think each cartridge will penetrate? Will one cartridge penetrate better than the other?