So I have this .308 lower...

[Walther White]

So I have this extra .308 lower just screaming at me to build something with it. And I already have a CMMG Mk3 that I built. What should I build? Is there something a little more interesting I could do than just another AR-10? I mean like AR-15's can be built as other calibers. So could I do something like that with this bigger lower or am I limited to the 308? I like having options....

[thegreatcow]

Unfortunately the standardization that exists with AR-15s does not exist with AR10s. What works with one part may not work with another. You'll need to first figure out which "pattern" of .308 lower. There's DPMS and Armalite "pattern" lowers. Once you figure that out, you then ideally want to buy a matching "upper" in order to ensure proper fitment and performance.

Once you determine that, you should be able to buy the uppers and parts you want to build your rifle.

[uechikid]

Put one of these on top of it.

http://aeroprecisionusa.com/m5e1-65-cm-18in-mid-ss-complete-upper.html

[Walther White]

Unfortunately the standardization that exists with AR-15s does not exist with AR10s. What works with one part may not work with another. You'll need to first figure out which "pattern" of .308 lower. There's DPMS and Armalite "pattern" lowers. Once you figure that out, you then ideally want to buy a matching "upper" in order to ensure proper fitment and performance.

Once you determine that, you should be able to buy the uppers and parts you want to build your rifle.

Its a DPMS Gen 1 pattern. Does the "Gen" make big difference in compatibility? Do I absolutely need the Upper to be a Gen 1 and therefore a Gen 2 would not fit even though DPMS?

[Walther White]

Put one of these on top of it.

http://aeroprecisionusa.com/m5e1-65-...ete-upper.html

Ooooh.......Me likey.........

[Quiet]

Its a DPMS Gen 1 pattern. Does the "Gen" make big difference in compatibility? Do I absolutely need the Upper to be a Gen 1 and therefore a Gen 2 would not fit even though DPMS?

The DPMS Gen 1 is not compatible with the DPMS Gen 2.

DPMS Gen 2 has some receiver dimensional differences that makes it non-compatible with DPMS Gen 1.

[Walther White]

The DPMS Gen 1 is not compatible with the DPMS Gen 2.

DPMS Gen 2 has some receiver dimensional differences that makes it non-compatible with DPMS Gen 1.

Dang, I can't find any 6.5 Creedmore uppers for the Gen 1!
Well, I'll keep looking.....

[Spaceghost]

Build one or pay a gunsmith to build it.

[Walther White]

Build one or pay a gunsmith to build it.

But, of course!

[dwalker]

I have 6.5CM and a 16" 308 and I am strongly considering a .260 build at the moment.
I love the 6.5CM. Excellent round.

[uechikid]

Dang, I can't find any 6.5 Creedmore uppers for the Gen 1!
Well, I'll keep looking.....

The Aero should fit, their lowers are DPMS gen I pattern and the Aero uppers fit most DPMS pattern lowers. As far as I know DPMS is the only one making and selling their gen II 308 lowers.

[Walther White]

The Aero should fit, their lowers are DPMS gen I pattern and the Aero uppers fit most DPMS pattern lowers. As far as I know DPMS is the only one making and selling their gen II 308 lowers.

But with slight variances, will there be wobble/fitment issues?