kevbo

Don't round those corners, they are there for a reason. This is what keeps the carrier from trying to rotate the bolt when the action is cycling, especially when stripping a round from the mag, or if the shell hangs a little going into the chamber. It is one of the little appreciated differences that makes an AK superior to an AR in austere conditions. If these get rounded from wear, it is one of the things that can cause an old AK to become tempremental. If you round those corners then any resistance met by the bolt causes the bolt and/or carrier to bind against the rails as they are then

I was biting my tongue, so as not to be a wet blanket, but since shalamov brings it up: It worries me too, but I don't think it is unsafe. The corners that have been trimmed from the cam slot and the cam follower on the bolt form a step that keeps the carrier from trying to turn the bolt when it is pressing it forward (which is almost the entire cycle except for and unlocking and a short distance after that). In the S-12 the bolt gets knocked off that step by the barrel extension hitting the cam follower on the bolt. That is the job of that angled corner at the open end of the extracto