Finally took delivery of new .270 left hand Rem 700. I need bases for the scope. What are the advantages/disadvantages in the 1 pc vs. 2 pc for scopes, including staying in line/focus? Also what is the advantage/disadvantage of Dual F/R cam lock vs. adjustable rear base (excluding scope movement) IE: cleaner looking, lighter, etc. Am I correct that most newer scopes have adequate adjustments to use the dual cam lock?