All this talk about AR's..


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geophysicishooter
September 5, 2008, 06:06 PM
I recently had occasion to be speaking to one of our fine West Point Cadets. Naturally the conversation began to steer itself to the topic of firearm and weaponry. So we got to talking about AR's. I asked him about how the 3 round trigger mechanism works and I asked him what the difference was between the way the semi-auto trigger and the mil-spec 3 round cycling trigger work. His explanation of the inner workings lacked rigor but I got enough out of to figure out that he didn't 'really know' either. I told him I had an AR and had become interested in the mechanicals of the rifle. He asked if it was a CAR or a post ban AR. We surmised that it was post-ban and wouldn't recieve the necessary parts to make it like the military grade M4 with selector switch and 3 round burst.

So I figured that I might put that subject to THR. Not that I want to do it for all the headache and lack of any real reason to, but I was just curious what the differences are in the way the semi-auto action of the AR compares to the full auto/burst fire action of the M4/M16.

Thanks

oh, if this material is covered with rigor elsewhere on the forum, let me know..

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Shung
September 5, 2008, 07:20 PM
You can find all needed litterature on various books or websites.

In full auto, what happends is that when closing the bolt carrier strikes the disconnector which release the hammer, which strikes the firing pin again.. and boom... and so on. Until you release the trigger.. But, I must admit that I have no idea how the 3 rounds burst works.. I guess it's a timing questions..

I won't get any more precise, because I don't know what this website and american laws permit to write.

briansmithwins
September 5, 2008, 07:54 PM
From the USMC M16 manual. You can download the full version here: http://www.box.net/shared/9qm9l5oplv

http://i2.photobucket.com/albums/y3/briansmithwins/fafunction1.jpg

http://i2.photobucket.com/albums/y3/briansmithwins/fafunction2.jpg

http://i2.photobucket.com/albums/y3/briansmithwins/fafunction3.jpg

http://i2.photobucket.com/albums/y3/briansmithwins/fafunction4.jpg

http://i2.photobucket.com/albums/y3/briansmithwins/fafunction5.jpg

geophysicishooter
September 5, 2008, 08:02 PM
Thanks. That was exactly the explanation I was looing for.

Bwana John
September 5, 2008, 08:02 PM
Try:

Marine Corps Technical Manual, TM 05538C-23&P2 - Rifle, 5.56-MM, M16A2 W/E NSN 1005-01-128-9936

Bushmaster used to give them out with new rifles, you could get a copy from them.

3-76 thru 3-81 "Fuctional Theory of Three-Round Burst Control"

It will tell you everything you want to know, even if some folks here think it's forbidden.:rolleyes:

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