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Only the piston spring, that's why I said to put a screwdriver or something with a shaft into the spring guide to control the main spring, once you get that and the guide out, it'll open up easy. Your trigger might pop out due to the spring, but it won't fly across the room. The tappet plate spring won't fly out either.
One thing to keep mind of is the selector plate spring, not that it's gonna fly off, but it has a tendancy of either falling out or springing off, but for the most part that spring sits kinda tight on the plate's nipple. If you ever do lose it, replace with a Bic lighter flint spring cut to the same length.
Oh, and if you have a V2 mechbox that uses the little motor adjust disk, use instant glue to keep it on. I worked on a guy's gun the other day to install a Trigger Master, tried cycling the gun to see the rate of fire currently (becauase that is adjustable with the TM unit), but the gun wouldn't turn over at all. Took the grip plate off, pulled the motor out, the disk was sitting on the side of the motor. Glued it in place. Dropped the gun off to the guy, he asked if I was able to figure out why the gun had seized up. Then I knew, the disk popped off when he last assembled it, and had dropped the set screw all the way down, causing the motor shaft to be pinned in place.
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