Best rail out there, but leaves a lot to be desired - SureFire Benelli M4 Shotgun Picatinny Rail System M80 for SureFire Laser sights flashlights

The side rails will not work with LaRue Tactical mounts - the center of the recoil lug is cutout does not probide sufficient backup. The sides will only work with cross-bolt mounts. The side rails also do not have clearance for a Thorntail due to the rubber barrel shroud almost touching the underside of the rail. Only the bottom rail is usable in my opinion. I also am not a fan of how bulky the rail is and removed it due to this aspect. Having said that, it is still the best forend rail on the market for the M4, but it is priced way too high for what it is.
Pros: Easy install, tight fit, not too heavy
Cons: Bulky and side rails do not meet 1913 spec

This review was written in the old system and had content requirements that are different than reviews written today.