How an AR-15 Works

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JEVapa

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Did I hear that correctly full auto is 3 round bursts?
I really do not know.
Two versions of select fire.
1. Full auto that disengages the disconnector and engages the auto sear.
2. 3 round burst - two piece disconnector which one side (semi) disengages and the other side engages a three notch (x2) cam and engages the same auto sear. It fires 3 rounds auto then stops.

Burst is useless which is why they went away from it.
They demonstrate both versions in this video.
 

O4L

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I almost didn't watch this video because I thought it was one that I had seen before, but this is the first time I've watched this one and it is a very good video especially for those that don't know or understand how it all works.
 

O4L

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Two versions of select fire.
1. Full auto that disengages the disconnector and engages the auto sear.
2. 3 round burst - two piece disconnector which one side (semi) disengages and the other side engages a three notch (x2) cam and engages the same auto sear. It fires 3 rounds auto then stops.

Burst is useless which is why they went away from it.
They demonstrate both versions in this video.
Why is the three round burst considered useless?
 

JEVapa

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Why is the three round burst considered useless?
Because no matter what a shooter does, with few exceptions maybe (probably a good bipod loaded up), the first round will hit, and the other two go somewhere else on planet earth. There isn't any time to adjust for recoil to bring the other two back on target. It's a bullet waster.
In auto, if a person knows how to shoot auto (6-9 round burst), he can bring the burst (not 3 rounds) back onto the target. Anyone on here that's been a maggot or an automatic rifleman knows what I mean.
 

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