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12/8/2007 9:12:45 AM EDT
I bought in a package and dont know which is which model.  Is the standard SIR rail the Bilevel 50C?

Which model is like the 50C but with a strait top rail?  

And out of the 2 which would you consider the "standard" one?
12/8/2007 9:28:00 AM EDT
[#1]
Have you tried here A.R.M.S.® Selective Integrated Rail System
12/8/2007 11:13:49 AM EDT
[#2]
50C is bi level
45C is flat
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