Energy Knight's Type Rail Cover Set (2/4/5/6 Ribs x 2) Black
[AS3469]

Fit well onto my M249 Para A5 well, but they were a little bit difficult to put on, they require a lot of pressure and if your fingers slip like mine did you can get a nasty cut.

However do thhe job well and comfortable. due to the slip i remove one star, but still recomend this add on.