Here’s my review of the Mancraft PDiK HPA Engine (made in Poland). Checkout their website www.mancraft.pl.
UPDATE: Mancraft has updated the PDiK and has eliminated the dual air lines, which also fixed the problem with the air line pig tail pulling out of the grip.
I’ve posted a video that demonstrates some of the tests you should do with your hopup, bucking and barrel to troubleshoot BB feeding problems. The video shows the BB drop test, BB push through test, and how to test for air seal on the PolarStar Fusion Engine.
Here’s a follow-up video showing how to sand down bucking lips.