Carbine ammo

[Allen]

G.I. carbine barrels were rifled after the gas port hole was drilled and reamed. If you see a carbine barrel with a burr around the port hole it's a safe bet that Bubba has been at it. Even reaming after drilling would still leave a burr around the gas port hole, although it would be smaller. Back in the 60's I saw a lot of new G.I. barrels (hundreds0 and I never saw one with a burr around the hole.
J.J.

Thanks. I figured as much since GI barrels didn't have the burr problem that Universal (others too) but didn't know for sure.