well and I thought I had seen it all. Put together a lower for my friend and it would only single fire. Found the trigger was considerably taller than any other. no it is not an m trigger, as I view the ar trigger photos. It does not have the cut out on the face. It is taller and wider. Upon comparing it with 7 other hammers, I have half big and half smaller. What gives? The parts, lower and upper, bolt are all RR. Any ideas? Could it be a 9mm type hammer, although it does not match the ar hammer photo for a 99 hammer.
Thanks guys.

I'm going to have to give this post the "Huh?" award for the week.

When you tried the other hammers did it function? (make sure you have an AR-15 firing pin) If it is a RRA hammer send it to me I will take it to rra and replace if defective
Robert

RB Precision
Po box 96
Preemption IL 61276


www.rbprecision.com

RB. Thanks for the reply, apparently you understood my inquiry. I had other rr lower parts kits, and the hammer out of one of those worked fine. I wish my digital was here, I would post a picture. The hammer is definitely different. Stamped on the side is CEIII. I will see tonight if I can post a pic. When the hammer is in the lower, in the firing pos, (upright) it measures close to .118 higher than the other trigger in the same lower. All I can surmise is it is riding high on the carrier or getting jammed when it goes to strike. I will immail you.I was going to call Pete, see what he thought, since I buy from him. thanks