Just came across these custom 10mm AR15 uppers.  The website (http://www.rmwxtreme.com/) is under construction but shows an email address for more info.

Barrel is 10.5".  Seems they run around $800.00.

Here's the best YouTube video I could find (though it's a full-auto set-up);  http://www.youtube.com/watch?v=Ro5_r3_vTZw

Anyway, just wanted to throw it out there for anyone who may be interested.

Deadly.

I will take one to go with a 16 inch barrel.

That was a lot $$ in 10mm ammo he just blew through in 2 seconds, 

Quote from: 4949shooter on September 01 2013 04:51:42 AM MDT
Deadly.

I will take one to go with a 16 inch barrel.

That was a lot $$ in 10mm ammo he just blew through in 2 seconds, 

Not to bad if you reload, which Ron does.

I thought Olympic Arms has offered a 10mm Upper for awhile ?
http://www.midwayusa.com/product/764759/olympic-arms-ar-15-a3-flat-top-upper-assembly-10mm-auto-1-in-16-twist-16-barrel-stainless-steel-black-with-m4-handguard-flash-hider-18-round-magazine-pre-ban

Are they gas or blowback operated?

The Olympic is blowback, chances are the other one is too.

Quote from: schtoolee on January 05 2014 04:07:01 PM MST
The Olympic is blowback, chances are the other one is too.

Thanks!

Quote from: schtoolee on January 05 2014 04:07:01 PM MST
The Olympic is blowback, chances are the other one is too.

Nope.  The RMW upper is gas operated & that's its major advantage.  Ron has been working for years with gas operated pistol caliber uppers.  10mm, .40, .45, .357 sig, and a few others.  Even 9mm, though that one requires hot loads to work properly.

--Dan

I contacted them a while back, maybe a year ago, about the uppers.  He told me it was about 6 months lead time and $800-$900 for a 10mm upper.
I haven't ordered one, yet.

Here is my Ron Williams RMW Xtreme built 10mm.

Where do you get a lower that takes Glock magazines?

Quote from: MikeS. on June 06 2014 09:02:37 AM MDT
Here is my Ron Williams RMW Xtreme built 10mm.

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Very nice, I must say

I want to order one of these. Never owned an AR before. I think the 16 " barrel is what I want. Owners and other AR guys, is this the right choice?

I am thinking about building one of these in a 10-12" pistol version?! Yes, no!

Quote from: Slateman on June 18 2014 08:49:35 PM MDT
Where do you get a lower that takes Glock magazines?

http://www.shop.doublediamondsupply.com/Custom-AR15-Glock-Large-Frame-Mag-Lower-Receiver-DDARFLC.htm