A typical application for small arms would be to replace the bolt which is used to seal the firearm by keeeping the bolt-head tight to the chamber as long as the projectile travels down the barrel.
A typical application for small arms would be to replace the gas operated and the heavy bolt mechanism (blowback) used in firearms today. Gas operated and heavy bolt based mechanisms preliminary function is to keep the bolt-head tight to the chamber as long as the projectile travel down the barrel.