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I prefer the 20" barrel. I'm tall, with long arms, so even an AR "rifle" isn't a big gun, though for "tactical" applications, negotiating doorways and such is going to be more difficult. My main concern is ballistics. My impression is that you really need 2700fps to get good terminal ballistics, and shooting 75 grain bullets in something like a M4, means your muzzle velocity isn't much more than that. I use iron sights almost exclusively, and the longer sight radius is a benefit, too.
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