Gas block and screw press: what they have in common

1. Step 1. Gas block — is part of — Assault rifle. It bleeds powder gases onto the piston.
2. Step 2. Assault rifle — evolved from — Rifle. An automatic weapon.
3. Step 3. Rifle — has part — Rifling. Rifling.
4. Step 4. Rifling — uses — Screw thread. Helical grooves.
5. Step 5. Screw thread — evolved from — Screw. A thread is an application of the screw.
6. Step 6. Screw — is used in — Screw press. The force is produced by turning a screw.

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