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Old 08-15-2011, 01:58 AM   #1
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Default understanding the AR a little more

so im not new to the handling of m16,ar 15's. ive been around them since 04, even slept with one. so a question i keep finding myself asking is about these black rifles is...i know they can be chambered in many calibers, .223, 6.5, .308, .458. how does this work. does the lower mag well have to be larger as well to accomodate the larger rounds? or does it turn into a one single shot rifle? so in theory could i use any lower and any upper chambered in different calibers? or does the lower need to be the correct caliber match?



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Old 08-15-2011, 02:26 AM   #2
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The differences you cite are the reason for AR10 versus AR15 type uppers and lowers. Case length of the .308 for example requires the longer magazIne well and bolt stroke found on the AR10 platform. Not 100% sure what the specific length is but of the calibers you mentioned I believe the .308 is the only AR10 round.



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Old 08-15-2011, 02:38 AM   #3
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Along with 308/7.62x51, AR 10 calibers include 6.5 Creedmore, 260, 243.

AR 15 calibers are the shorter rounds, 22lr, 223, 5.56x45, 6.5 Grendel, 6.8 SPC, 458 SoCom to list a few.

There are other calibers in both platforms.

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Old 08-15-2011, 02:49 AM   #4
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or does it turn into a one single shot rifle?


No it does not become a single shot.



so in theory could i use any lower and any upper chambered in different calibers? or does the lower need to be the correct caliber match?

As long as you have a mil spec AR 15 lower, you can attach a mil-spec AR 15 upper of any caliber to it. Some calibers require a change in the bolt due to larger case diameter. For example a 5.56 bolt will not work with 6.8 SPC ammo.

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Old 08-15-2011, 03:02 AM   #5
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Quote:
Originally Posted by Gatoragn View Post
Along with 308/7.62x51, AR 10 calibers include 6.5 Grendel, 260, 243.

AR 15 calibers are the shorter rounds, 22lr, 223, 5.56x45, 6.5 Creedmore, 6.8 SPC, 458 SoCom to list a few.

There are other calibers in both platforms.
AR-10's can be chambered in nearly any .308 length cartridge. 7.62 X 51, .260 Rem, .243 Win, .338 Federal, etc.

The AR-15 is limited to 5.56 X 45 size cartirges. 6.5 Grendel uses a 39mm case length and works in this platform. In addition to Gator's above list
.500 Beowolf, 7,62 X 39.
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Old 08-15-2011, 07:51 PM   #6
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Quote:
Originally Posted by jjfuller1 View Post
... does the lower mag well have to be larger as well to accomodate the larger rounds? or does it turn into a one single shot rifle? ...
Some loads for the 5.56/.223 have bullets too long to feed reliably stacked up in the magazine. These rounds, which tend to be 80gr and above, would have to be fired single shot. The case is the same length as normal but the bullet is longer, making the overall cartridge length too long for the mag even though the single round will chamber properly.
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Old 08-15-2011, 08:54 PM   #7
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thanks. lotta good info



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