Nerf Rival Knockout Picatinny Adapter

I saw this picatinny rail mod for the Knockout and couldn't help thinking that a simple insert might work better (arguably). With the need for cutting or gluing on a rail now eliminated, the possibilities have vastly expanded. Did someone say two picatinny rails? How about putting on two of these?

Parts:

Should be self-explanatory (send me a comment if for some reason it's not). You can find the 3D printed short dart barrel mod for the Knockout here.

Printing:

Nothing special here. Just make sure that the model gets good print bed adhesion.

Assembly:

Jam it into the original Rival round holders, and off you go!

Note:

You may want to glue the part in if it's going to take a battering or starts falling off.