For those that do not need picatinny slots at the end of their rail, this one has full arca. Ideal for the 580cc and 700cc bottles
 
Features:
 
MLok slots at the bottom and on both sides of the rail for add-on accessories.
Low profile, hugs closer to the bottle
Sling QD slots on both sides
6061 T6 Alluminum 
Black anodize
From start of trigger guard until the end of rail is 15.75 inches x 2.75 inches wide