The .30 Carbine has NEVER had a penetration issue. Inside 200m, it will out-penetrate a .223. The problem with the Carbine in Korea was using it beyond 300m, something it was never intended to do. The Carbine was so loved and so favored, and so damn good at what it did, people forgot that it wasn't a main issue battle rifle. They kept asking more and more of the design, and were surprised and offended when they found the limits. By today's standards, the M1 Carbine is a damn good PDW.
