Lowey Bolt Protector Brno/CZ 22LR & 22 Magnum (NOT CZ455)The bolt protector has been designed to house the bolt and automatically release the pressure from the spring when inserted. It also protects the bolt from dust dirt, knocks, falls and is an excellent accessory for storage and transportation of your rifle. It is a must have for every shooter, as many laws now require the bolt to be transported and stored separate from the rifle. Features Made from plastic, so it doesn't damage the bolt in any way.