I have all ready posted in the optics section but I would also like an objective opinion from you on the advantages and/or disadvantages between the SS10x42 and the 10x42M. I am going to mount it on a 20" AR15A2 in an ARMS #2 carry handle mount with ARMS #21 30mm STANAG rings. Money is an issue but if there are big advantages to buying the SS10x42M over the SS10x42 I would like to know what they are. If the side focus adjustment is a much better system why is it only offered on the 10 power scopes and not the 16 or 20 power scopes? I am trying to decide between those two scopes and I would like to have as much information on them as possible. Thanks for your input.