p.s I don't have a camera so i had to get pictures from the internet.
Step 1: The mod
Now all you have to do is take the green piece on the Strikefire and slide it across the bottom of the Recon's barrel extension.
Step 2: How to make streamline darts
step 2.You need to cut off the edges until the top(orange and black part ) is comepletely cut off.You no you did it right if you see a orange circle inside the dart.