Not sure how it applies to the Gen2 handguard but mounting your optics over the upper and the handguard can lead to POA/POI changes due to the flex on the non free float handguard.

Seeing that you have a long piece riser joining the two you might be okay, but if you start to notice POA/POI shifts, try mounting on the upper only.

That scope suits the look of your rifle perfectly, i hope you have lots of satisfactory trigger time with your 15-22...great rifle.