AR-15: How many different calibers can be used

[Elk_Sniper]

I know on an AR-15 lower you can do 223-556 and 300 blackout. What other calibers or caliber uppers can be slapped on that same lower?

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[bcp]

I can't count that high with my shoes on.

Try this:

List of AR platform cartridges - Wikipedia

en.wikipedia.org

Bruce

 

[trukinbear]

The list is nearly endless. Personally I've got one in .22WMR, .223 Wylde, & .300 Blackout, and I'm currently building 9mm, .410 (shotgun) and working on having a barrel made in .30SC

 

[Elk_Sniper]

Sorry for my ignorance I don't know the real difference between AR-15 and AR-10 other than AR-10 is larger calibers that was my curiosity as how large of a caliber you can go on the 15 lower And what all the options are using that one lower.

 

[Will_White]

Sorry for my ignorance I don't know the real difference between AR-15 and AR-10 other than AR-10 is larger calibers that was my curiosity as how large of a caliber you can go on the 15 lower And what all the options are using that one lower.

50 beowulf is the biggest you can put in an AR15 lower. 50 BMG is the biggest you can put on an AR15 lower (commercially)

 

[Elk_Sniper]

50 beowulf is the biggest you can put in an AR15 lower. 50 BMG is the biggest you can put on an AR15 lower (commercially)

Whoa really? So what is the difference in ar 15 and 10?

 

[Will_White]

Whoa really? So what is the difference in ar 15 and 10?

Action length. AR15 is a .223 length action, AR10 is a .308 length action.

 

[arakboss]

50 beowulf is the biggest you can put in an AR15 lower. 50 BMG is the biggest you can put on an AR15 lower (commercially)

I would like to own a 308 bolt action upper that would fit on AR15 lower.

 

[Will_White]

I would like to own a 308 bolt action upper that would fit on AR15 lower.

Yeah it seems like you can have magazine length cartridges or you can have the really big stuff, with little in between. I think Uintah made one (maybe)

TBF it would have to be pretty cheap or extremely light in order to compete with an AR10 or a cheap bolt action. The 50 bmg and 338 uppers are a couple thousand vs ten thousand or more for a dedicated rifle.

 

[orygun]

I can't count that high with my shoes on.

Try this:

List of AR platform cartridges - Wikipedia

en.wikipedia.org

Bruce

107 in an AR15, some wildcats.

 

[Steel Head]

I know on an AR-15 lower you can do 223-556 and 300 blackout. What other calibers or caliber uppers can be slapped on that same lower?

So far I have 223 wylde and 22 arc and soon I'm finishing a 338 arc barrel.

A few friends have 6mm and 30 caliber and I've seen .45, .50, 7mm and 9mm AR15's.

 

[Steel Head]

107 in an AR15, some wildcats.

Pretty crazy huh?

 

[orygun]

Pretty crazy huh?

Yup.
5.56 is fine for me. Not much of a desire to try anything else. Yeah, I'm not much fun.

 

[Steel Head]

Yup.
5.56 is fine for me. Not much of a desire to try anything else. Yeah, I'm not much fun.

My serious AR's are in 5.56 but I absolutely love my 22Arc.

It's basically hearing safe with the can and gets out to 1000 quite well.

 

[arrowshooter]

I run .17-556, .223, 20 Practical, 6.5 Grendel, 6.8 SPC, 300 BO and 450 BM. A wish list would include the .222 Remington.

 

[ilikegunspdx]

I know on an AR-15 lower you can do 223-556 and 300 blackout. What other calibers or caliber uppers can be slapped on that same lower?

Go to bear creek arsenal and click on upper left icon. In the scroll down click on "calibers". That will show you all the uppers available for both at-15 and ar-10 (35 calibers total). Black powder is also available from other places.

Shop AR Firearms, Uppers, Lowers, Barrels, Parts and more! | Bear Creek Arsenal

Come shop high-quality AR-15 and AR-10 rifles, complete uppers, lowers, barrels, bolt carrier groups, and other parts from Bear Creek Arsenal at great prices!

www.bearcreekarsenal.com

 

[Medic!]

OK can we clean this mess up?


Stop with all the calibers of guns being called AR-15. [ Gun nuts have so little imagination].
I bet with just a bit of effort we could come up with different number designations?


Maybe AR-15. AR-16, AR17.
Heck I don't care. AR-37!

Then us slow kids can keep up.

 

[Elk_Sniper]

Okay so can I do 6.5 PRC on a AR-15 lower or does that need to be AR-10? And are the parts even available?

 

[Koda]

Okay so can I do 6.5 PRC on a AR-15 lower or does that need to be AR-10? And are the parts even available?

If the cartridge overall length is longer than the 556 it needs to go in an AR10, otherwise it will work in an AR15.

 

[Elk_Sniper]

If the cartridge overall length is longer than the 556 it needs to go in an AR10, otherwise it will work in an AR15.

And see that's what I thought but up above people are saying you can do up to 50 BMG and I'm like holy crap that's bigger than my magazine