This is a Pump Action kit for practically anything. I used a Tri Strike, which has a 8 cm prime, but for smaller primes it still should work. This is best paired with a spring upgrade. There are no files for the bars, as I just used some out of my Erector set. The original priming rod that goes through the blaster is what I connected the bars onto.
Also, support my friend's Youtube Nerf channel below. He really got me into the hobby:
The barrel will take roughly 12 hours to print on 10% infill.