What was the actual line of reasoning behind the moderators on the early carbines? I get that they help with cycling, but why didn't they just 86 the moderator and replace it with an equal amount of additional barrel length? I'm also not clear on why they were necessary in the first place. Our 10 inch carbines work just fine today, and I'm not seeing any obvious reasons why they shouldn't have worked just as well sans moderator back then.
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