Gonna buy a clip on real soon, I have a AICS 1.5 stock so I am planning on getting an IMUNS. I don't know if I should get the 20 MOA version IMUNS seeing how I have a 20 MOA mount for my day scope. Or is the standard IMUNS okay? I'm not getting a PVS 27 or anything so I doubt I will be shooting it beyond 300 yards or so. I am looking at the ATN PS40 or the new 28 they have. Also I have emailed B.O. and I have not heard back from them yet but does anyone know the diameter of barrel you can use with the IMUNS? I have a Rock m24 barrel and it's fairly thick. Thanks...