Training bolt for rifle

A training bolt carrier group for use in an automatic or semi-automatic firearm, which firearm is capable of firing live ammunition and includes a bolt receiver having a predefined configuration;

• a hammer/trigger/safety mechanism comprising a hammer, a trigger and a safety;
• and a barrel extending from said bolt receiver and terminating in a muzzle;
• comprising:
• a training bolt installable in a bolt receiver of a firearm, wherein the training bolt is constructed and arranged with cutouts and protrusions which cooperate with the predefined configuration of the internal structure of the firearm bolt receiver and which allow function of the hammer/trigger/safety mechanism of the firearm, wherein the training bolt is configured to prevent, absolutely, chambering or firing a live round;
• and
• an elastic instrumentality, having one end thereof attached to said training bolt and another end thereof extending through said barrel and out said muzzle, to provide simulated operation of the training bolt.