Rifle Scopes Ring height?

[Kyskeet]

Will be mounting NF NXS 5.5-22x56 to a Ruger RPR gen 1 (picatinny rail top of hand guard). Need to know ring height required.

 

[BigTex]

http://www.mil-rad.com/scope_ring_calculator

1.5" should work

 

[10xk9]

Go with something extra high. Otherwise the 56mm objective will hit the hand guard on the RPR. I’ve got a Razor Gen II HD 4.5-27 x 56 on my RPR and it requires the tallest nightforce rings they make .