45 degree Picatinny Rail for the Colt M733/CAR15 longer carbine handguards (different from M4/M933).
These fit in place with the ribbing on the handguard and fix through the front 3 holes with use of M5 Nuts and M5 x 8mm Flanged Bolts.
This gives a 45 degree 6 notch section of Picatinny rail on the Right/Left/Both sides (different files for each). It is designed to the rail section is level.
Cetus PLA PLA