Hello. I have another question and I hope this is the right platform to ask it. I just received an ar 10, lr 308 dpms u-build it kit I purchased. The barrel is coming separate. While waiting on the barrel I thought I'd begin putting together the upper receiver. I got the ejector port on the upper and then I began working on the forward assist. After a little research, I noticed that the ridges on the BCG once in place inside the upper receiver, are actually set lower then the tooth on the forward assist. I can't see it's necessisity in this position. So my questions will be; is this normal for the ar 308, is it just there for looks? And if not, what may be the problem? On my ar 15s, the forward assists are all lined up perfectly with the ridges on the BCG. I read in a forum that the 308 really doesn't need a forward assist. Any help will be greatly appreciated. Thank you all.