The original 15 round magazines for the U.S. M1 Carbine did not lock the bolt back by engaging the slide notch. When the 30 round magazines were introduced they included a different follower that caused the slide to stop at the point the slide pin would engage the slide notch. Some of ...
1. U.S. Carbine Cal ___ 30 M ___,just fill in the spaces exactly as it appears on your receiver. Handstamped receivers are uncommon, but can be determined by looking closely at the fonts, spacing, and whether they line up. Notice that some receivers have a period both after the "...
he or she knows nothing about carbines. The only numbers on a GI Carbine are the serial number on the rear of the receiver with the maker’s name, and the manufacturer’s name and date on the barrel.