Re: Foreward Assist ??
Just my .02....... I have a DPMS styled IRA lower that I will be building soon. One of the main reasons that I am getting an IRA upper is the lack of FA, and still having an ejection cover. The IRA is a bit pricy compared to the DPMS models but has it's pluses.
The 308, as well as a 223, cartidge is a straight case. Applying force to a walled cartidge is asking for trouble. If the round doesn't go in using a FA is only going to enhance your problem. Shoving a round into a dirty chamber, scratched chamber, etc, etc only means you are going to need to use more force to extract the cartidge.
With a 223 upper, Mil Spec parts are everywhere, therefore a FA is the norm. With a 308 there is no standard... There are RRA, Armalite and DPMS styled systems. You might as well get the system that works for you.
I'm going to get an IRA sans FA. I would get the DPMS but it is the higher rise railed upper which doesn't trip my trigger, no pun intended.
YMMV