As far as I know, the AR-15 platform they only feature the standard flat-top uppers or carry handle style, they aren't really defined under generational status to my knowledge.
You mean for the .308 right? So far we don't have any members that have posted comparison photos...
Right. So was it upper receiver differences you wanted to know about, or lower receiver differences?
Since it appears you have your info straight, I'm taking the liberty of locking this thread. Thanks to the regulars for helping get this sorted out, and if anyone is reading this as a newcomer, I hope it is helpful to you.
By relaxed he just means uncompressed, if you measured it that way you have the relaxed measurement. CMMG is rightly another four-letter word around here, their products are preferred by Satan worshipers and sadists everywhere.