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Old 05-01-2013, 03:41 AM   #1
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Default Difference between an AR-15 or M4 carbine

am having a difficult time understanding the difference between the two. Also the M-10. As I understand it the AR-10 came first from Amaralite and the AR-15 came based off that. Is the M-4 just the military version? Little history lesson here please.

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Old 05-01-2013, 03:43 AM   #2
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M4 is an automatic or select fire version of the AR15 with a 14.5" barrel.

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Old 05-01-2013, 10:14 AM   #3
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M4 is an automatic or select fire version of the AR15 with a 14.5" barrel.
But, they put some of the M4 upgrades in semi-autos, and sell them to us regular people as M4's, no? Sometimes called M4geries?
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Old 05-01-2013, 11:25 AM   #4
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The M4 specific features, besides select fire, that should be on a AR model being sold as an M4 type should include:

Grenade launcher mounting cuts in the barrel.
1:7 rifling twist.
Chrome lined bore and chamber
Enlarged feed ramps
Flat top upper with feed ramp extension cuts
6 position collapsible stock with mil spec diameter receiver extension
Bolt carrier with shrouded firing pin
Gas key that is staked
Extractor with carbine extractor spring and buffer and o ring.

Some M4geries will just have the grenade launcher cuts, whatever collapsible stock and commercial receiver extension, a flat top and they'll call it good enough to be a visual representation of an m4.

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Old 05-01-2013, 01:54 PM   #5
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The m4 has a 16in barrel not a 14.5. And the ar15 has a 20 in barrel .

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Old 05-01-2013, 02:01 PM   #6
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Originally Posted by SSGSF View Post
The m4 has a 16in barrel not a 14.5. And the ar15 has a 20 in barrel .
The civvy version is 16" military 14.5". Ar15 can be anywhere from 9-26" depending on taxes and paperwork and who is making it.

What we call m4 are just ar15 dressed up to resemble the military carbine.

The common ar15 is not much different than grandpappy's m1 garand from ww2 or uncle jimbob's remington autoloading deer getter. It fires one bullet each time the trigger is pulled.
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Old 05-01-2013, 05:03 PM   #7
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The AR-15 was the 15th firearm designed by ArmaLite back in the 1950s. Colt bought the rights to the rifle and by 1963 our military began buying them in quantity and eventually it became the M16. Civilian (semiauto) versions continued to be sold as the AR-15. At first the barrel length normally was 20" but carbines soon showed up. Today the military has moved toward the 14.5" M4 and civilians often buy the 16" semiauto version of the M4, for example the Colt 6920.

Anyway, AR-15 now is a generic term for a family of rifles/carbines/pistols and M4/M4gery is one of the carbine versions. Of course there are many, many brands besides Colt today and hundreds of different names for their products. We tend to lump them together as the AR-15 since they are largely compatible with the rifle of the 1960s.

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Old 05-01-2013, 10:02 PM   #8
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Quote:
The M4 specific features, besides select fire, that should be on a AR model being sold as an M4 type should include:

Grenade launcher mounting cuts in the barrel.
1:7 rifling twist.
Chrome lined bore and chamber
Enlarged feed ramps
Flat top upper with feed ramp extension cuts
6 position collapsible stock with mil spec diameter receiver extension
Bolt carrier with shrouded firing pin
Gas key that is staked
Extractor with carbine extractor spring and buffer and o ring.
Correct me if I'm wrong, but the Colt LE6920 meets this list? Minus the 14.5" barrel, of course......
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Old 05-01-2013, 10:08 PM   #9
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Yes the Colt LE6920 meets that list. It's a semiauto 16" version of Colt's military M4.

The last line about the extractor... I've heard it called black insert not buffer and the O-ring may or may not be installed.

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Old 05-01-2013, 11:15 PM   #10
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Quote:
Originally Posted by Quentin View Post
Yes the Colt LE6920 meets that list. It's a semiauto 16" version of Colt's military M4.

The last line about the extractor... I've heard it called black insert not buffer and the O-ring may or may not be installed.
Correct. I've heard the urethane plug refered to as an insert or a buffer, and I've seen themn in blue or black. And you are also correct that some will not have the o-ring, and some may or may not have a D shaped ring instead. Thanks for adding the clarification.

Since they are under the extractor, it's usually not something you are going to get to check out in a gun store before you buy.
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