If it has come out completely, lubricate the disc brake piston and the piston bore (in the caliper) with clean brake fluid. Make sure the dust boot is clean and is seated in the caliper. Using a turning motion (back & forth), roll the lip of the dust boot over the piston and push the piston into the caliper by hand as far as you can go. You'll need a c-clamp and a block of wood (or an old brake pad) so that you can push the piston all the way into the bore. Go slowly as you are pushing and keep an eye on the piston so that it goes in straight with no resistance. You don't want to damage the sides of the piston. If the piston goes to the bottom with no problem, seat the dust boot lip into the piston groove. You'll have to bleed the brakes once the pads are in and the caliper is reinstalled.
Possible reasons: 1)You'll have to check, but some calipers have to be turned in like the cap on a bottle of soda. Others have to be pushed in while being turned. 2)The caliper is not seeded correctly meaning that it is not going in straight. 3)The caliper is seized up, meaning that there is something between the piston and wall keeping it from moving. Rust maybe. If the boot around the caliper is torn then this is probably the case. 4)It's unlikely, but on the inside of the walls of the caliper there is a seal, if the seal is damaged then it might keep the caliper from being pushed or turned in.
A gearbox in an airsoft gun is basically what propels the bb's out of the gun. A series of gears spin and push a piston into a cylinder. Because the piston fits very tightly inside the cylinder, the air that was inside the cylinder has to be pushed out, so it's pushed out the other end where the BB is and this pushes the BB out of the gun.
Mastercylinder or wheel cylinder or caliper piston? If it's a mastercylinder, toss it and get a new one. Wheel cylinder, squeeze the brake shoes together, if it won't move, toss it. Caliper piston, use a c-clamp and compress it. Now keep in mind. If it is a rear wheel caliper and it has any slots, like a regular screwdriver groove, or a plus pattern. These cannot be pushed but are rotated either clockwise or counterclockwise. If it's a long slot use a flat bar or huge screwdriver, if it is 4 little cuts in the outer edge, use a pair of needle nose plyers and span the difference. Than use the tools to try turning the piston. It should move fairly easy, if not, toss it and replace. (Rotation of the piston is how the emergency brakes set)
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