Like new centurion c4 mid length cutout rail for sale. Fits mid length AR15's. Comes with FSB, barrel extension and 3 KAC rail covers. This was taken off my recently bought centurion upper. Don't mind the gap in the rail in the first picture, the rail hasn't been tightened down yet. The gap will be gone once its tightened. Material: 6061 T6 Finish: type 3 hard coat anodized Weight: 12.4 oz with screws; 1.1oz with standard barrel nut Length: Top 9 1/4in Sides 11 1/2in Bottom 10 5/8in Width: 2.1in Height: 2.38 Rails: 1913 spec rail with proper T-marks Inside diameter: 1.37 Rails: 1913 spec rail with proper T-marks Fasteners: grade 8 bolts phosphate finished $250 O.B.O.