French to English Other Other Shotgun / rifle manufactu

This is a transcript of an interview with someone who works in a company which makes hunting rifles and shotguns. The employee I stalking about what is involved in assembling the gun. He prepares the parts and then puts them on a workbench for assembly.

Et après, je fais toutes mes pièces comme ça, la bande, la cale unique. On prépare la cale unique mais le castolin, on le met après.

Thanks

Mark