Hi all, first time poster. I ran into a problem with my buddy's Well MB08 when upgrading it. Got the barrel, hopup and everything installed, but when I put the cylinder parts and the trigger box in, the piston would not engage with the sear unless the spring guide stopper is removed. Once that is taken out it will engage just fine. I'm at a loss for what the issue is. I made sure the piston was able to fully retract onto the guide and spring, and I even removed the bearing at the bottom of the guide but to no avail. The parts used are Matrix/PPS piston, spring, and guide kit, and Atlas Custom Works trigger box. Any help is appreciated.