I’ve had a YHM rear Buis for quite sometime now on my RRA. The RRA has a fixed front site. So there was no need to purchase the buis in a pair. Well now I have a M&P with a rail type gas block. I transfered the YHM rear buis to the M&P and bought a YHM front site flip up today. When aiming the front sight post is apparently taller than the rear, and there is no elevation on the rear buis. Suggestions? Is this suppose to be? Thank you…
The front flip you bought, you purchased a gas block mounted version vs a rail mounted version, correct?
Correct, I purched the" gas block mounted flip sight", and I have a rear flip sight. And yes it is sitting on the gas block 
JIC anyone is wondering 