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Basic
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Posted: 12/4/2012 1:47:40 AM EST
Other than the barrel profile and feed ramps, what are the differences between the CAR-15 and M4 style rifles?

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Link Posted: 12/4/2012 2:22:12 AM EST
"Site Staff remembers when you could buy a keg of musket balls for $1.75"

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Link Posted: 12/4/2012 2:54:52 AM EST
What's the difference in the upper? Flat top vs. carry handle?

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Link Posted: 12/4/2012 2:55:17 AM EST
There are a ton of small differences. It would be like comparing an SP1 with an A2...but for me the most important difference is the weight! An early Colt "CAR 15" should weigh 6 lbs new from the box unbuggered. Pencil thin bbl, no forward assist...slabside reciever, thiiner dimensions overall, A1 sights, A1 flash hider, a different rifling twist, A1 furniture, but all this does not mean that it is not an excellent rifle! It is one of my favorites and I will keep mine till I die. There was no better handier lighter woods rifle ever made!

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Link Posted: 12/4/2012 3:04:25 AM EST
"Site Staff remembers when you could buy a keg of musket balls for $1.75"

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Link Posted: 12/4/2012 3:56:21 AM EST
"CAR-15" is really too generic of a term to be talk much about "what is the difference," while the M4 is a clearly defined thing and model type and configuration (though it is used by some generically as well), "CAR-15" can refer to almost anything from a Colt R607 SMG to the RO727 M16A2 Carbine, between which there is almost twenty years development and changes.

So, I suppose, in general - the difference is that "CAR-15" tends to apply to almost any pre-M4 AR15-style carbine of almost any configuration - barrels ranging in length from 10" to 16", several variations on stocks, upper and lower receivers, barrel profiles, barrel twists, and official nomenclature.

"M4" on the other hand, tends to refer to the USGI M4 Carbine, Colt model RO920, or any other substantially identical model and/or commercial, export, or civilian counterpart thereof.

In the generic sense - it refers to an AR15-type carbine model using a carbine length gas system, with a .750 gas block seat and fixed "A frame" FSB, M203 compatible "government profile" barrel with a flat top upper receiver.

~Augee

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Link Posted: 12/4/2012 8:15:24 AM EST
[Last Edit: 12/4/2012 8:17:14 AM EST by LungShot]
I own a High Standard HSA-15 A2 (non-removable carry handle) with the M4 profile 16" 1-9 5.56 Nato barrel.

I don't know if all A2 receivers are like mine however my A2 does not have the M4 receiver extensions.

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Link Posted: 12/4/2012 8:53:03 AM EST
Originally Posted By Augee:
"CAR-15" is really too generic of a term to be talk much about "what is the difference," while the M4 is a clearly defined thing and model type and configuration (though it is used by some generically as well), "CAR-15" can refer to almost anything from a Colt R607 SMG to the RO727 M16A2 Carbine, between which there is almost twenty years development and changes.

So, I suppose, in general - the difference is that "CAR-15" tends to apply to almost any pre-M4 AR15-style carbine of almost any configuration - barrels ranging in length from 10" to 16", several variations on stocks, upper and lower receivers, barrel profiles, barrel twists, and official nomenclature.

"M4" on the other hand, tends to refer to the USGI M4 Carbine, Colt model RO920, or any other substantially identical model and/or commercial, export, or civilian counterpart thereof.

In the generic sense - it refers to an AR15-type carbine model using a carbine length gas system, with a .750 gas block seat and fixed "A frame" FSB, M203 compatible "government profile" barrel with a flat top upper receiver.

~Augee


Boom!

My personal favorite variation would be the 733

I bought both
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Link Posted: 12/4/2012 9:56:07 AM EST
Yes, our parts are tight, we did that on purpose.

Don't sweat it. It's a service rifle, not a Fabergé egg. "Hognose'
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Link Posted: 12/4/2012 10:03:33 AM EST
Originally Posted By LungShot:
I own a High Standard HSA-15 A2 (non-removable carry handle) with the M4 profile 16" 1-9 5.56 Nato barrel.

I don't know if all A2 receivers are like mine however my A2 does not have the M4 receiver extensions.


Most commercial fixed carry handle carbines do not have extended feedramps (and many commercial brand flat tops, for that matter).

In fact, extended carbine feedramps (though slightly shallower) were originally introduced on Colt commercial / export carbines like the RO723 and RO727.

~Augee

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