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Yes, the bolt tilts. Locking shoulder (available in different lengths) sets the headspace, so you can screw the barrel in and have the front sight timed properly (at 12:00 or TDC) without having to shave off the receiver end of the barrel.
Gas piston has gas tube, but it isn't full length, and gas piston is its own separate part. Piston impacts bolt carrier, which unlocks the bolt as it travels backwards.
Double spring in the butt stock pushes back forward on the rat tail (or the spring above the bolt/bolt carrier in the case of the folding stock para models) to strip the next round off the mag and chamber it and lock hte action back up.
Here's a nice short vid of one firing with the top cover removed so you can see the gas piston slam back, the bolt carrier move back, and then the bolt move back.
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