Oohh... nice rifle!!! FYI: to use BOTH of those sights, the rail on the gas block needs to be at the same height as the rail on the receiver. From the pic it looks like the gas block is sitting a "bit" lower than the receiver. Hard to tell, as the picture is not very clear. Put a level on it, or stand the rifle upside down on a smooth flat surface (kitchen counter) and see if the rail on the gas block matches up with the rail on the receiver.
If they don't, you can still use the rear sight. You'll just need a front sight that is made for standard gas blocks. They are very common, so it shouldn't be a big deal. Just a bit pricier than the Magpul front sight, since they are made of metal.
Fulton Armory makes two that are compatible with the shorter gas blocks. It's the "TITAN Series".
They make two versions. One with a
standard sight post and the other is a
National Match "NM" front sight post. The price is $60 and $70 respectively. They also sell the
Magpul rear sight for $58.
Also, be sure to break that barrel in correctly so it will be more accurate. The MFG's recommendation is below.
What is your break in process?
We recommend cleaning the bore every round for 25 rounds and every tenth round for an additional 100 rounds. Use a bore brush or bore snake with either CLP or solvent.