It is chromed in both chamber and bore. And you can use 5.56 in it.
BTW, is the receiver marked "Car-15" or "SP1?"
IIRC, by 1972 all of them were chrome lined, had 5.56 chambers and round hand guards.
The designation 5.56X 45mm was not in common usage outside of military circles back then, and 5.56 rifles were generally marked .223
For those who have fought for it, freedom has a taste the protected will never know!
Or at least they did before political correctness
Last edited by locutus; 11-30-2012 at 04:05 PM.