You have made a wise choice,RRA quality is as good as bushy & armalite & even colt,Fit & Finish are better.The wilson barrels are made by wilson arms not combat,chrome lined chamber & bore are a $30 option not standard.The brake shown on the pre ban configurations on RRA'S web site is as far as i know the only one they offer,the option is you can get it on post ban uppers,it is pressed on & has no function,just for looks.The upper you described is an HBAR config. but they do have m 4 profile.I ordered the exact same upper with a fake brake cant wait to get it.If you have anymore questions reply back & i will try to help,i researched RRA for a couple months before i chose them.There is a guy here who is the authority on RRA & also sells them,PETE IN NH,you can find him on the industry forum at legal transfers.