Hey guys, I'm new to this forum and wish i had found it sooner at the beginning of my build. I'm huge into ARs and build all of mine, but I've never built a dedicated pistol caliber AR. I decided the 10mm would be perfect for this build and after looking around for a few days i started ordering parts. I could really use any recommendations you guys have to offer for this little project as I'm new to 10mm and new to dedicated pistol caliber ARs. I've got a .45 cal lower amd upper receiver on order as well as an 8" 1:16 twist blowback barrel and bolt carrier on order. Also ordered some Glock 20 mags and was disappointed that i couldnt find any Glock big sticks. What info or parts would you guys turn me toward?

http://10mm-firearms.com/10mm-rifles/rmw-extreme-build-it-has-begun/

That is pretty much the collective wisdom of our 10mm AR experts.

Thanks for the link, I've been reading through it for a while and some of it has been helpful, but i still have a few questions. How does the performance and reliability of a 10mm AR compare between DI and blowback? What about the performance between 1:10 twist and 1:16 twist?

For a big stick look at Kris Vector. They had some sort of extension for G21 mags...which should fit a G 20. Might even be able to buy them already finished.

I had an Olympic 10mm upper several years ago. The thing ran flawlessly.

Tony