Charging_Handle: Although I dont have a complete RRA rifle, I did purchase a RRA Entry Tactical upper. Mine actually has the press fitted A2 flash suppressor over the end of the barrel. That seems to be a hell of a price Gunsmoke has going for a complete RRA rifle, although it does appear to have more CAR style features than a M4gery would. Not sure if they are offering the press fitted suppressor or actual muzzle brake (but I'm sure they could mount a postban A2 style if thats what you wanted). The M4 handguards that I received with my upper were double lined Colts or copies, might want to verify the same from Gunsmoke.
My upper has a chrome lined barrel and chamber -$35 upgrade from Sable Co., its possbile Gunsmoke offers this upgrade on the complete rifle as well.
Not sure what the chamber specs are - never have paid much attention to that sort of thing, but I've fired, Winchester Q3131A, South African battle pack stuff, some old Norinco, PMC,and Winchester commercial soft points without any failures that weren't mag related.
Do a search on the RRA in the "Rifles, Uppers, Barrels and more" section of the board. You'll find lots of input on the complete rifles and uppers. Here's a link to my original post after I received my upper:
www.ar15.com/forums/topic.html?id=121038 Here's a pic of my RRA/Colt Rifle, with a few changes/upgrades:
All in all I think you'd be happy with the rifle and the service provided by Gunsmoke.