PRI Gen III round carbon fiber forearms have several options to choose from.  The overall length of the rifle length forearm is 12.5" the ID of the endcap is 1.75".  The forearm with no holes and no rails weights .7 Lbs.  Forearm with standard rail package weights 1.05 Lbs. forearm with standard rails and long bottom rail weights 1.1 Lbs. the standard rail set up is a 8.5" top rail with lugs and 3 3" rails at 3,6 and 9 O'clock positions.  The forearms come with 3 color options, Natural carbon Fiber, Cerakote black and Flat Dark Earth.