I bought this case for my POF P415 w/ 11" rail. The rail was too long to fit into the channel and I would have had to cut the foam out where the pistol handle would be. I used it for another M4 with plastic hand guards and it fit fine. Other than that the case is top notch.
Pros: Didn't fit M4 with 11" monolithic rail
Cons: Did fit M4 with plastic hand guards
This review was written in the old system and had content requirements that are different than reviews written today.