diffrences ar15, m16. m4
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Old 11-07-2011, 02:34 PM   #1
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Default diffrences ar15, m16. m4

What is the diffrence I know ar is semi only civians have them.
Are they all the same lowers??
When bare?

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Old 11-07-2011, 02:57 PM   #2
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AR-15, semi auto version of an M16

M16 Military version, with full auto or burst

M4 would be an M16 with a collapsible stock and a 14" barrel vs the standard 20"barrel///some people call there AR-15 an M4 due to being as close to the real deal as possible

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Old 11-07-2011, 03:00 PM   #3
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The internals of a full auto lower are different in the way they are milled, also a 3rd pin is added just above the safety for the auto sear. Which has to be used with a full auto carrier.

The lower is the only real difference between a full auto and a simiauto


Selector, hammer, sear, milling of internal lower receiver, 3rd pin, sear relief in the upper receiver, carrier, and I believe that it as far as parts not the same from AR-15 and M-16

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Old 11-07-2011, 04:50 PM   #4
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You can get full auto ARs some how or another, they cost way more that you would ever really should spend in a gun, and have a ton of paper work to follow with as well.
With the 14" barrel on the M4, that would also be classified as a short barreled rifle, unless you added a permanent flash hider or something to the barrel to make it 16" or an over all length of 26"

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Old 11-07-2011, 06:24 PM   #5
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Nathan's answers are right as usual but there are and have been exceptions in regard to the AR-15.

Though the AR-15s manufactured today for civilians generally are semiauto (there are plenty of LE and military contractors getting select fire ARs), early AR15s most certainly were available in full auto/select fire form and some still exist today. In fact the first autos the US military purchased in the early 1960s were called AR15 long before the M16 nomenclature was assigned to them. Even after they were marked M16, AR15 still showed up in the roll mark.

ETA:
Colt Armalite AR15 (pre-M16) - note the very early serial number!

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Old 11-07-2011, 09:08 PM   #6
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Since it was first built, the internals of the AR lower have changed to make it much more difficult to install full auto fire control components. In the current rifle, there is simply no place for them to fit. Otherwise, the ATF gets unhappy about the rifle being "readily convertible" to full auto.

The M4, besides short bbl and collapsing stock, does not have a full auto mode, but does have a "tri-burst" mode- 3 shots per trigger pull. Still a machine gun as far as the Feds are concerned.

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Old 11-08-2011, 01:24 AM   #7
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Quote:
Originally Posted by Redarrow18 View Post
You can get full auto ARs some how or another, they cost way more that you would ever really should spend in a gun, and have a ton of paper work to follow with as well.
With the 14" barrel on the M4, that would also be classified as a short barreled rifle, unless you added a permanent flash hider or something to the barrel to make it 16" or an over all length of 26"
The true M4 has a 14" barrel.

Only us non military or police personal have to give a crap about that dumb 16" restriction.

He ask about an M4 I answered to the best of my knowledge. Kinda where the 18"SPR came from, if the military was using 16" barrels this would be pointless.

Common military barrel lengths are 14",18", and 20" for the 5.56 cal

Civilians are stuck with the pointless law that says a rifle is 16" or more.
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Old 11-08-2011, 02:33 AM   #8
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Quote:
Originally Posted by Nathantc View Post
The true M4 has a 14" barrel.

Only us non military or police personal have to give a crap about that dumb 16" restriction.

He ask about an M4 I answered to the best of my knowledge. Kinda where the 18"SPR came from, if the military was using 16" barrels this would be pointless.

Common military barrel lengths are 14",18", and 20" for the 5.56 cal

Civilians are stuck with the pointless law that says a rifle is 16" or more.

Is it 14" or just slightly over? I can't remember what ours were. At the time I really didn't care because I hated to clean them and the mil doesn't give you much of a say in things.
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Old 11-08-2011, 04:49 AM   #9
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Quote:
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Is it 14" or just slightly over? I can't remember what ours were. At the time I really didn't care because I hated to clean them and the mil doesn't give you much of a say in things.
its around 14-14.5 some thing like that, but even whith the gi flash hider, its still under 16"
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Old 11-08-2011, 05:22 AM   #10
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If I remember correctly it's 14.5 w/o and 15.8 w/ A2.

The hoops to go sub 16" are unfortunate for sure.

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