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The follower in the 30 rd mag can not function at all when the mag is removed. The mag catch acts in conjunction with the 30 rd follower when the mag runs dry to hold open the bolt. Removing the empty 30 rd mag allows the bolt to snap forward. The M1 carbine has a manually operated bolt hold open pin on top/rear of slide to hold open the bolt slide/bolt. At least on the carbine currently owned.
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