Nordic Components - Optics Planet has them in stock. I really like mine. Have only had it for a hundred rounds or so but no issues yet with suppressor. I wanted a 9.25" barrel with a longer handguard, but they are currently not selling direct since they are fulling distributor orders. I went with the 16" which is ok and no SBR hassle.
You may want to check with them on your trigger type since their website says mil spec hammers (flat vs rounded face) only. (I believe Cmmg says the same thing) I called them since I have Hyperfire triggers and they said they haven't had any issues with them.
My neighbor has the CMMG and has not had any issues. (Actually he used the CMMG bolt and built his)