Aimpoint, eh? Single slot pad in front? I'm not familiar with the Aimpoint family and how they mount. 
I will recommend the full lenth picatinny rail of the ARMS18 (at this point), then all of the Aimpoint can be shifted forward or backwards. YMMV
Hope this helps...
Barney
I will recommend the full lenth picatinny rail of the ARMS18 (at this point), then all of the Aimpoint can be shifted forward or backwards. YMMV
Hope this helps...
Barney




















































