Bolt carrier and internal combustion engine: what they have in common

1. Step 1. Bolt carrier — is part of — Assault rifle. It reloads the weapon.
2. Step 2. Assault rifle — evolved from — Rifle. An automatic weapon.
3. Step 3. Rifle — has part — Rifling. Rifling.
4. Step 4. Rifling — uses — Angular momentum. Spin stabilizes the bullet.
5. Step 5. Angular momentum — is used in — Flywheel. A flywheel stores rotational energy: conserved angular momentum smooths a machine's motion.
6. Step 6. Flywheel — is part of — Internal combustion engine. The flywheel smooths out the engine’s strokes.

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