I know the Sentinel is out of Stock, where did you get the Sig??
I run the Romeo Zero, and its been good to me after only 300 rounds, but still holding zero. I just saw they were in stock at Grab A Gun for 199. Lots of posts on screws and such around this board. I just went and bought the correct length in button cap at my local hardware store. Been working well.I know the Sentinel is out of Stock, where did you get the Sig??