I have a Rock River upper on order, and plan on shooting it on top of my SP1 lower. After reading about ramping the bolt carrier or rounding the hammer, I went ahead and looked at my hammer.

http://home.earthlink.net/~kingstan/trigger.JPG

It looks pretty flat, does anyone think this may work as is with the RRA upper?

Thanks for any input and hope everyone's having a great weekend.

regards,
Joe

Check biggerhammer.net for pics of more hammers. I know that one of mine worked, but the other two did not.

Thanks Jack,
    Looks like an auto hammer, so I guess it may work. Or do I have to file that nub of the top right? hmmmmmmm

Joe