Using a firearm safety flag
Sliding a soft, plastic firearm safety flag into the breech of your firearm shows that your firearm is safe for both the user and others close by. It is simple and effective and will not damage the internal surfaces of your rifle.
To insert a firearm safety flag:

1. Grasp your rifle firmly in one hand, and have the safety flag ready.

2. With the bolt open, slide the firearm safety flag up into the breech.

3. Check the flag is securely in place.