School me on the AR

[Ohno]

I was looking at ArmsEast website the other day and saw they were selling two different lowers a 5.56 and 6.8spc one.

I thought the AR was modular platform in that you could swap out different upper calibres on the same lower. Now my question is do you need a different lower for different calibers?

I've seen mag well adapters so you can use a 9mm upper on your lower. Is this the same with swapping to 6.8spc?

Also I think the 6.8spc mags are different from 5.56 mags, so do they need a different mag well to fit as well?

 

[Boltgun]

there is no difference between those lowers other than the roll marks that say 5.56 and 6.8/ that and the serial number.

Also the mags are slightly different in the feedlips. Nothing to do with the magazine well.

Boltgun

 

[Hungry]

If you don't buy an AR15, yer #### will fall off!

Sorry, I just could not help myself.

You will love this platform. Building one is the most fun you can have with your clothes ON! It's right up there with paintballing every week.

Cheers,

Barney

PS: now typing with one full hand and one finger from the broken one!!

 

[Ohno]

LOL Thanks Hungry.
I've watched your M-14 Clinic videos and got a chuckle.

So just to get this straight. The AR-15 platform is only limited by the size of the mag well. It can take 5.56/7.63x39/various pistol cartridges/ and the 6.8spc.

Related to this would a different recoil spring/buffer be required if shooting heavier cartridges?

The AR-10 handles larger cartridges based on the 308 case as well as some of the Short Mags. So as long as the case fits the mags it could be a go?