Hello - I'm thinking of buying a 9mm upper to put on my RRA AR15 lower with a RRA 2-stage trigger. I've been doing some reading, so I understand the concept behind ramping the 9mm bolt. My RRA hammer has a flat face so I am told you technically don't have to ramp the bolt. Here is what it looks like, sorry I do not know how to attach a photo:
http://www.bing.com/images/search?q=rra+two+stage+trigger&id=5B1B694ABDC94491C7E369B5CD44013DE3286B29&FORM=IQFRBA#view=detail&id=5B1B694ABDC94491C7E369B5CD44013DE3286B29&selectedIndex=0
In any case, I still have a few questions:
1) Is it a good idea to ramp the bolt regardless of the type/make of AR hammer in the lower. For example, if I would get another AR lower with a DPMS parts kit and hammer, would I still be advised to ramp the 9mm bolt? (I realize that you don't have to ramp the bolt if you're using a 9mm hammer, but I want to stay with my AR FCG.)
2) Some of the reading I've done says that the 9mm bolt is hard on the lower. In which case I would definitely get another lower, or even a dedicated 9mm AR. Will I damage my RRA lower if I switch back and forth between my 9mm and .223 uppers?
3) Other than a 9mm complete upper and a magwell adapter, are there any other parts I would need to change out in my RRA lower to work with the 9 mm upper. (One part I have heard you should change is the buffer, although I am not sure why.)
Thanks