what ar15 uppers require diff lower?

[jag609]

I would like to know if somebody can post/refer information in regards to what uppers can be used with what lowers.

i.e. what lower is required for .50 Beowulf, .308. 6.5 grendel, 6.8SPC, etc

thanks

 

[trueblue1776]

universal, with exception of large pin colt brand rifles.

 

[10-Ring]

As I understand it, 308 will require a larger lower...not sure about the others

 

[TX1911fan]

Yes, 308 will require a differnt lower. 223, 6.8 and .50 Beowulf all take the standard lower. You can also get a .22lr conversion kit for the standard lower and the standard 223 upper. It has a funky magazine and a replacement bolt. Very cool.

 

[trueblue1776]

sorry, didn't notice ".308" listed, though that would make it not an AR-15 due to the longer round.

 

[jag609]

brain fart .308 is AR10.

 

[RockyMtnTactical]

AR's can be chambered in so many different calibers it would take us forever to go over which calibers are found chambered for an AR and which goes on which lower.

In short though, 243, 260, and 308 are a few that require something other than a AR15 lower...

Of the calibers you mentioned, they all work with AR15 lowers besides 308.

 

[Still 2 Many Choices!?]

Don't forget...

You can also "wedge", some of the beefier and more hard hitting calibers into the normal-sized AR lowers if you custom chamber the upper for those short magnum cartridges; but I hope you don't mind single loading, because good luck finding mags in those non-standard AR chamberings !!

Still 2 Many Choices!?

 

[zoom6zoom]

There's one maker who builds a lower with interchangeable mag well parts, but I can't remember who it is at the moment.

 

[JWarren]

Cobbs and MGI make the mulit-caliber AR-based rifles.


John

 

[DogBonz]

basically

Anything that has an OAL less than or equal to the 223 will work on a standard mil-spec lower. That said, Alexander Arms does make "50 Beowulf and 6.5 Grendel specific" lowers, but I think that just means that they are stamped "50 Beowulf" or "6.5 Grendel". But I may be wrong.

 

[Coronach]

Sun Devil billet uppers only work with Sun Devil lowers.

Mike