Hypothetically speaking, wouldn't a AR type rifle be more practical to have if our country was put under maritial law or our Government gave up our soverienty to the United Nations. I would think that an M1A ( which I feel is the best battle rifle around) would be useless after your ammo runs out since the 308 would be harder to steel from the enemy. I could be wrong, but I thought that most NATO and U.S. military types use 223. I think that some Special Ops use 308 but it wouldn't be as common as 223. Someone convince me otherwise so I can have some peace of mind in knowing that if I buy a M1A it would be common place to get 308 ammo if or when I ran out of my own supplies. Thanks for any responces